I feel for you, but frankly, there isn't much to go on here. Can you read any markings on the capacitors? Your overall best bet is to solder in replacements and try them. There was a large number of bad electrolytic capacitors reported about 6 years ago that affected a lot of the indistry.
If you can't read the values from the bad capacitors, try taking apart one of the good ones and getting the values from there.
As for amplifier recommendations, it is really difficult to do anything without a spec sheet. We would have no idea on the sensitivity and responsiveness of these speakers. I guess I would start with an amplifier of at least 100W/ channel. That should drive anything reasoable, and you likely don't need to be producing sound levels needed in large theater spaces.