I have a PoweMatic 66 cabinet saw. We used it one day to make a ton of cuts for shoulder joints. When almost done, and after a small rest (while we assembled the boards), I needed two more cuts. Tried cutting on the PM66 but it wouldn't come to operating RPM needed. It does start. I pulled it apart, cleaned out lots of sawdust (some discolored) and tried again with same result. Tested the two capacitors and replaced one. Tried again, same result. Read on some posts but not tracking. One said to check the starter switch one one end, but mine has an external start switch with push button stop. What am I not getting and what should I do next? I'm well beyond my capabilities.