I think I will try and find space on or off both pa to replace the 50V 470uF
pairs with something higher than 50V. They are part of the LC LP filter
straight across the output via the o/c Rs. As there is nothing wrong with
the speakers or leads then internal punch across these downstream of mosfet
electrolytics (test to 60V ok) is likely reason for blowing the 0.056 ohm
resistors on the outputs and then blown mosfets.

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/