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There is a panel behind the brew unit, that has 2 screws. Remove it and clean the coffee residue behind it. That is what drains the pressure relieved after brewing, and has coffee residue that can build up and cause the leak. It should leak into the drip tray though, except when you rremove it.
Make sure that the sensor in the water tank has not stuck IIRC it's on the right hand side as you look at the machine from the front. Then run some water through the steam nozzle, it could just be that following the descale there is no water in the boiler and you just need to fill it as you did when it was new.
Hope this helps.
I assume yours is not the digital, here are some instructions for properly descaling your machine. 1. To decalcify your boiler, remove your water tank and fill it with hot water (100 to 120 degrees). Open a pack of decalcifier and mix into the water tank. Once it is dissolved, place the tank back on the machine, and then turn the machine on. 2. If you just open the steam knob and run approximately eight ounces of solution into a spare container. Turn the machine off and let set about 10 to 15 minutes. Longer is better. It is very important that the machine does not remain on to heat the boiler anymore than necessary. 3. Repeat step #2 for your machine. Do this until you have consumed the entire water tank of solution (approximately four to five cycles). (I do it at night before I go to bed and let the last cycle set in the boiler till morning.) 4. Remove water tank and rinse it with fresh water. 5. Refill water tank with fresh water and place it back on the machine. Repeat step #2 to rinse the machine, only this time use the entire water tank at one time, and there is no need to let it set. Remember, it is better to descale more often than not enough.
If it leaks from the steam wand then you need to get a new steam valve assembly. For the heat you will have to open the machine it is possible that the steam boiler is damaged or that the thermostat on there is bad, use an ohmsmeter to check thermostats and element. There are 2 screws in the grinder, 2 behind the water tank and about 2 or 3 in the front behind the door.
I think you have get air in the system, try to find a bellows pump or similary. Fill it with water, open the steam knob and take of the water tank, put the pump in the water inlet and press. When the water begins to flow, close the steam knob and put the water tank back.