Water Heater to Hot !!!!

Did you establish an air pocket in the tank to allow the water to expand as it heats up...if not, your relief valve will weep.

Water Heater Air Pocket:
Shut off the water supply, open the relief valve until water stop coming out, close it, turn the water supply back on.
This will reestablish the air pocket in the water heater, giving the water some place to expand to when it is heated.

I'm thinking thermostats or main control board.

I have all ready replaced it.

I had to replace the pressure relief valve this summer. As the hot water heater got up to temp the relief valve would open and it spewed water (several gallons, I'm sure) until everything cooled down enough for the valve to close again.

It was the one time I didn't have my infrared thermometer with me so I couldn't verify the water temperature, but when I ran some into a cup and put it to my lips it was far from boiling hot. So I figured it wasn't the thermostat, and replacing the relief valve fixed the problem.

Its about a 1/2 to 1 cup every time.

Is it just a dribble that stops after a while? Thats very normal. If its constantly leaking then your thermostat needs to be replaced. Depending on the type of thermostat, you may be able to find one at Lowes or HD. I've found not much price differential between them and the RV stealerships.