[Amps] 91B problem in Paraguay

[DALE LONG]

Turned on my hosts amp this morning and tripped the 2amp slow-blow fuse...Got more fuses this afternoon and same thing keeps happening.
 
Seemed to shut down normally althought there may have been a problem with a sticky T/R relay before turning off the amp.
 
Any ideas what could be causing the 2 amp fuses to blow when turning on the switch?
 
Thanks
 
Dale ZP6/N3BNA