Dead Alto Trusonic TS110a powered speaker

Strat_a_tat_tat

Been using it as a monitor for gigs... for a few years. Died on a recent gig.  Turned out the main fuse (next to the power input socket) had blown. Replaced it... and the LEDs light up... and if I plug something into the instrument input, I can see the peak level LED lights up as it should  - so I guess the input stuff is still working... but absolutely no sound coming from the woofer or tweeter.

Any ideas on what components may have blown (I know it's a 'how long is a piece of string' type question... but just wondered if there was a common component failure on these models)?

Cheers.