L'esprit d'escalier. Next time I'd remove the speaker connector on the
main pcb, and solder in the sp wires and add solderable/desolderable
tags on the rear outlet pcb, to give some space for the replacement
components. So can get some air through the replacement components
rather than just around, as well as the same simple baffle to direct air
into that backwater area. Did use long W/W Rs rather than the squat ones
that were in there, so at least the tops will be in moving air.
Added a simple LED monitor , requiring 25V pk-pk 4KHz or 10 V pk-pk
40KHz and about 4V of 200KHz before the LED is visible in a dark room,
wiht instructions to owner to ignore any pulsing with notes, just a
continuous LED would mean a problem in the making.