[Swan] Mark II Amp problems

[WAØYFR]

My Mark II is blowing fuses. Just looking for suggestions….
Disconnected RF deck HV connector – still blows fuses.
Disconnected one HV output lead on transformer – filaments light OK, does NOT blow fuses so assume Xfmr is good.
No ohmmeter shorts found. 
Diodes check good. 
Caps don’t measure short but don’t have cap checker.
Could be original caps – Anyone have experience on caps likely being the problem?
 
Thanks,
WA0YFR