A mate managed to blow up his Peavey by running most of a PA off it at practice, the trip went, here is his drummers (my ex drummer who forgot his kit to a gig)'s account:
'the power transformer was red hot 15 minutes after the amp transistors had cooled down
but even after that had cooled, still no go
and we bypassed the trip
we removed the connectors and, erm, connected them :)'
His suggestion to fix being bypassing the trip that had tripped, then wondering why it still broke.