I had a lightning surge hit my system via cable coax. Knocked out 2 components but XPA-5 appeared ok. It did have a few protection faults but they corresponded with channels hit on my Meridian 861. I had the other components repaired but now I noticed that the XPA-5 is running hot even with no signal. My speakers are very efficient and heat has never been an issue, Sound quality is still good.
What might be the cause and is it related to power surge? Unit is out of warranty, ballpark repair cost?