H/T integration-AGAIN

I've read most of the posts I could find here on Agon but still have some questions about using my CJ PF-R along with an Adcom GTP-760 for movies. I even called CJ and the rep. (Knut) was a little confused himself. It has been my understanding that I should take the outputs from the processor which handle the front main speakers and run those into my 2 channel pre. The CJ has a couple of inputs named EPL-1 and EPL-2(external processor loop) each of these has a corresponding output. All of the CJ's inputs are line level inputs; if I run the front main outputs of the processor (which are meant to be run to an amp) to the CJ's line level inputs, won't that be a signal which is greater than the voltage that should be run into a preamp? When I first got the CJ pre I hooked it up this way and it worked, although the volume setting of the CJ had to be turned up at least twice as high as it had been for music.
After a while my amp started shutting down(protection mode kicking in). The would briefly shut down, then come back on, then shut down etc... I sent the preamp to Conrad Johnson and they had difficulty in finding anything wrong with it. They eventually notified me that it was repaired and they returned it without telling me what they found wrong. The person whom I bought the unit from picked up the bill($117.00) for the repairs as he sold it with a 90 day warranty. In addition to the integration questions I still have, I am now wondering if I had caused the problem by hooking it up wrong. In which case the seller shouldn't be responsilbe and I owe him the repair costs.

SO: 1) How do I integrate the two units? (if at all)
2) Do I owe the seller a refund?

Thanks,

Steve