[mikethedruid]

The only answer I can give as to the cap heating is, if it was subjected to a reverse voltage it would probably have broken down the electrolyte and then the cap would behave like a resistor. In that case it would heat up. I have actually seen caps installed back wards explode with a loud POP splashing goo all over the stuff near them. Even if it was re-installed correctly, after the breakdown, it would still act as a resistor. That's all I can think of, unless the voltage rating of the cap was being exceeded.