I have a valve actuator (CVA-24T) that has stopped rotating. When I place the switch to On1 or On2, I can feel the motor inside trying to work but the gears apparently are frozen. Is this a serviceable device? The cheap-skate in me is probably going to open it up and take a look inside. However, before I do this I wanted to pick the brain of someone who knows more about this than I. Is there anything I should look for first? How much current is too much current for this DC motor? I did remove the actuator from the valve and then I tried to force-ably turn the valve but it didn't budge. Thanks in advance if you can offer any words of advice.