[TenTec] Centurion QSK relays - easily replaced?

[jsb at digistar.com]

Just curious - do all Centurion amps, new and old, have the same relay?  I
remember the 422B had what looked to be a relay with a rubber
sound-proofing cap on it.  I've never seen the insides of the older
Centurions.

I ask because i'm curious if the relays are easily replaced - if I bought
a used Centurion and wanted to replace the QSK relay (or have some spares
on hand) if the relay was push-socketed or required a lengthy dissassembly
for replacement.