Amp repair...What to expect.

It's not break-in it's parameter settling of mainly large signal components such as power transistors and it's not 3 months worth of listening. It's substantially shorter at least audibly. 25...50 hours is more realistic.
Leaving unit on stand-by for a few days will also do the trick.

Mine took 50 hrs. to start sounding like a Sunfire again. Then at about 300 hours, it opened up and sounded like its old self (except that now it was dead-quiet).

I like the DYI spirit in several of the posts.

Just last month I got tired of dropouts on my two Sherbourn 5/1500A monoblock construction amps, chatted with a friendly tech, ordered $2.50 relays, and using my Xtronic solder gun and air tool workstation, some desoldering wick, and high silver content solder, i replaced all 10 relays.

In the process i removed all connector harnesses and applied electrical contact paste to these and the terminals, dusted the heatsinks.

I have been making sweet eyes at Pass Labs and Classé monoblocks for a while, but the 4 of them would be hard to justify (CP-700 biamps) now with perfect Sherbourns.

To Marakanetz and other Sunfire owners...

This is an interesting find, but price is too high:

http://www.ebay.com/itm/281100878773?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2648

I've seen that, but there are much better options here at 'gon for $700.

For those who's not technical, I'd say that it's still a bargain even if you will have to send the unit back-fourth to/from WestCoast to service it.
They sound like class A more than class A/AB/B and they never run hot with plenty of power to drive any speaker and SILENT when no music no matter if you mute or unmute your preamp.