Adcom GFA-5500 Musical Concept Mods

Anyone ever heard this amp with these mods? I've got a 5500 that's at least 15 years old and sounding tired. I'm trying to decide whether to have it modded/updated/serviced or replace it with something more current. The reliability of this amp has been bulletproof but it's sounding a bit bloated and harsh lately so I need to do something.