Help with McIntosh Repair Facility

OP, it sounds like when you switch cables at all is good except r&l channels are reversed, did you try to leave that,and change pre end also, that would fix channel reversal 

No because there is an issue to begin with and I want to get it resolved.  I did switch the speaker cables for both channels at the amp and the problem follows from the right to the left.  Measured the dB levels using a test tone and there is a 8-9db difference.  Two sources have told me they think it's the bias but we'll see hopefully very soon.  

I want to thank everyone who contributed to this thread (even aniwolfe haha)  Much appreciated :)  With the help of Monty a fellow audiogoner he hooked me up with a retired McIntosh repair guru and we took my amp to him this past Friday. He bench tested and found the bias was a little off and also calibrated the meters.  He found the left channel meter was reading high of all things.  This shocked me but hey they both read the same now and both channels are healthy and putting out equal power. Listened to the amp over the weekend and so far all is well.  It's also a good piece of mind that the amp was serviced by a professional and he gave it a clean bill of health. 

Great news, glad it all worked out for you.

Thanks dill. Just realized I never answered your original question. Did I try the 2 and 8 ohm taps. No I didn't.