NAD 214 in protection mode

Hello!

I hope I can receive some help in here. I have an old nad 214 with several problems. Well some of them are gone by now I think.. I bought it as not working ( stayed in protection). After reading about some of the usual reasons why the protection circuit could be on, I think I need some "new thinking" -fresh eyes on it :)

What I have done so far is:

-Replacing the output caps (C202-C205 + C901-C902)
-changed the output relay
-adjusted the dials on the left and right channels to 20mV (after 30 minutes)
-redone all solder joints
checked:
-C226
-D212
-R233
-C224

Okay... When I now turn the amp on it goes out of protection, and clicks the relay ON, and lights green in the powerlamp. BUT when I connect the speakers to the binding posts it clicks back in protection... funny... disconnecting the speakers again and it comes back on. I found out that when I switch to bridge mode, it goes in to protection as well :confused: I think that's where I need some help. Something in the output is wrong or out of specs.

I have heard that the IC 201 could fail as well, but I´m having a harder time finding a replacement to check with.

I hope some of you know something about the old NAD amps :o

Best regards
Martin