Bel Canto Pre2 mod/update?

I've had a Bel Canto Pre2P (purchased here) since ~2009 and it does everything I need in a combo 2 channel/HT system.  And it still sounds quite good.  I leave it powered on constantly.  When it does power up it displays a version number with a 2004 date, so it is pushing 20 years old.

I'm wondering if I should get it "tuned up?", that is have some caps/resistors replaced, perform any biasing, etc.  I also have no idea who I would send it to for this tuneup.  I'd appreciate anyone chiming in with recommendations.

TIA,

       Mike