As Dave said, the mainfarme contains a power supply that converts line to 40 kHz for distribution to the modules. Each 1/8 module was allowed 20W max. The LO was therefore "stuck" with an allocation of 40W. There are several reasons these capacitors fail in the LO module. For one, most MMS systems were sold into military depots. They were left continuously on, and that is one way electrolytic capacitors wear out. Also, as Dave mentioned, the LO module is particularly packed, so pushing cooling air through was not easy. And finally, it's possible that Sprague no longer was at the top of their game.
For anyone on this list, replacing the capacitors with something similar will be more than adequate as the system will not be running on a Navy ship for 20 years continuously. In fact, looking at Gene's pictures in the other thread, I see a label that tells me where that particular system lived its life.
Attached is a typical module supply schematic. It's not out of the LO module, but it shows the basic idea.
Vladan
