Sounds right and the case from the 90s through the 2000's regarding the design choices around the regulators. The resistor choices on my M60 and 5000 regulators divided a large amount of voltage across the regulators, unnecessarily, either from regulator IC aging or poor design. That and the use of non-ceramic resistors burned a hole in the PCBs. It took a lot to repair the PCBs. The original low wattage resistors were completely destroyed. I added heat sinks and adjusted the divider ratio (from memory) on the M60's but just the heat sinks and ceramic resistors are enough. Left the ratio alone on the 5000's. Should be easy to bolt on a big heatsink with your regulator configuration. I would do that.

My experience with the cap aging was similar and worse since the speakers were older. Many were essentially on their last legs. Cap tech is so much better now and we shouldn't have any issues in our remaining lifetime. I used the Panasonic FR series but any quality long life cap is fine in the power supply sections. Where space allowed I used higher rated lifetime caps (usually larger physically). The signal path caps are all non-electrolytic so no problems there, generally.

My digital board caps were fine minus the ones around the voltage step down functions if memory serves. Any electrolytics near heat are worth replacing all in one go, if not all of them.

The whole effort was time consuming, but worth it- really seemed to improve sound quality. All speakers from the 90's and 2000's need to be serviced if used even a moderate amount or left on in "stand-by." In "stand-by" the analog amps are all powered with regulators burning away and caps aging.

Distributor3 for surround sound integration, Integra Pre/Pro, DSP5000.2's, DSP5000C.1 24/96, M60 mk1's driven by hot rodded DEQ2496, M33's