Some of jet points inside jacuzzi are not mixing air with water

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the motor protection device is sensing to many amps. could be a flow restriction or the pump motor bearings are going bad.

if your tub was not used for a bit of time your gonn have to pop open the sides and have a look around , Hoses that go nowhere or loose looking are what your looking for, plus water leaks , i did have a problem once with squirels getting inside one and eating hoses off ,made nest inside and generally messed things up inside it but any wild animal could do the same thing

Surging is caused when the pump doesn't have enough water to push to the jets. this is usually a problem caused by air being drawn into the suction of the pump.
take a look at the jet(s) facing the suction cover.
I have seen cases where the water with the air mixed in causing bubbles gets sucked into the suction of the tub and causes the surging because the pump is pulling in too much air.
try rotating the nozzle of the jet facing the suction away from it. point it another way. turn the air control knob closed and see if that is the problem.
the only other issue that could cause this 'surging' problem is a leak in the suction line and could be the source of the water you see under the tub.

look on the back of the motor there should be a shaft that you can try to turn to spin free because something inside the pump is blocking it. rate me if this is helpful.

There are several cleaning methods on the internet. I would contact the maker of the tub and see if they have a cleaning agent. I know that Jacuzzi and Aquatic industries have a cleaner that works rather well. I have seen one on the net that uses 2 teaspoons of powder dishwasher soap mixed with bleach. I have not tried this one so don't know how well it works. The ones from the tub companies are not cheap, but if you want something that is going to do the job, spend the money.

you probably have a check valve (back flow preventer) on the line that supplies water to the spa when the pool is filtering as normal. Your check valve may have some debris in it or the seal inside may have failed allowing the water to drain into the pool when the system is off. You should see a valve on the return line that splits off from the pool return line on your system. There are several different check valves on the market, some have a clear lid that you can inspect without taking it apart. Some of them cannot be taken apart. Your challenge will be to find the check valve, then try to check to see it debris may be holding it partly open or it the rubber seal inside is damaged or missing. I hope this helps.

try turning off the 5 previous jets in order to see if there is enough water flow to get to the last jet.

Try turning the jets clockwise while they are running and see if this makes a difference.

you need to turn the air on should be some sort of cap or screw in type thing to let the air in open it