Where can I buy a replacement Group Head gasket for Woolworths Elevation pump espresso machine please?

Group head leaks can be caused by group gasket, portafilter basket (cup), valve, pipe fittings. Call back your service tech.
* Check group gasket and position of portafiler handle when pulling shot. The handle needs to point directly at you (your chest) if it points to your left shoulder or pops off the group then the gasket is worn, not correct size, missing spacer.
* If the handle points to the right shoulder then the gasket is, too thick, too many spacers, or it was installed without removing the old coffee (crud) from the group head and is stuck under the gasket. Remove and check group gasket and spacers.
* If the handle points directly at you but portafilter still leaks then check the basket (cup) insert. Many Barista's smash the portafilter on a bumper. If the bumper is worn and the metal bar is exposed then the basket insert will have a flat or dented lip. Check all your inserts for damage and replace worn bumper (a piece of water hose cut to size works)
* Still leaking? Remove cup tray above group and check group head for leaks around the pipes and fittings. Note: water discharge from bottom of group valve is normal DURING the pulling of a shot. It should not continue to drip water after pulling the shot.
* Still leaking? The group head needs to be checked.
* Pump, water lines, Water by-pass, Economiser, Hot water wand, and all the water fittings.
Aloha, ukeboy57 (youtube)

Group gasket issue, depending on the age of the machine the gasket might be dirty, use a Q-tip or your group brush to clean, if machine has over 2 years use then replace group gasket.

Correct, inside the grouphead their is a gasket which is the same diameter as the filterholter which make the perfect fit so the presure of the water will not leak out. So now either the gasket is damage in one point so you have the leak from that point. Second the gasket have become hard so it can not make perfect fit with filter holder. In both above case you have to replace the gasket. Finally their is aposibility that the gasket is dirty with coffee remains and again we can not have a perfect fit. You can use a hard brash with the water running so you can clean the gasket.
With this case you can unsrew also the shower from the grouphead and clean it also for better coffe results

1. empty the water tank
2. turn machine upside down
3. remove shower rose(one screw in middle)
4. remove group head (two hex screws)
5. pry out old gasket
6. fit new gasket and reassemlbe

Hi
You need to replace the brew head gasket. It becomes hard and will not seal. Order 2 gaskets because 1 always fails on Friday before a big party on Saturday.

Hi
Your brew head gasket needs replacing. They get hard after about 6 months to a year depending on how long the machine is on. if it on 24/7 it need to be changed every 6 months. If turned off daily every year. The gasket is up where you install the portafilter to make espresso. The black ring is rubber and that is what need to be changed. Have one setting right here on my desk.

Sounds like the gaskets need replacing.
A faulty steam solenoid can cause no water from the group head too

The group head gasket needs to be cleaned or replaced. First get a brush and clean put the head, then insert back wash filter(basket with no holes) in portafilter, make sure that it is seated properly(atleast 90° angle with machine), then run the head if nothing leaks around the portafilter the gasket is fine, if it leaks then replace the gasket. Make sure that you press the stop button before removing the back wash filter.

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The left grouphead sounds like a different problem than the right group head. For the left grouphead, I would start by replacing the group electro-valve. With hard water, this can cause the valve to remain in the closed position even though the water pump is running.

For the right group head, I would want to see this happen. Usually, if the gaskets haven't been replaced in a while (if you are busy, your 'while' may be quicker than others), I would evaluate the condition of the rubber gasket. I would also look at whether you are tamping too much espresso grounds into the portafilter. This can cause a similar symptom as a bad gasket.