I agree with Paul, the change of engine noise you are picking up on at that revs is prob clutch slip as the "power band" is normally higher revs, 4 - 4.5K, i find it strange that the clutch has gone at 65,000 miles, i think the previous owner has clutch control issues, a clutch should last alot longer than that if driven properly.
I also agree with Solhatt about your error 1 code, this was the problem i had with mine, switching on / off, or ejecting & replacing disc sometimes rectified it, but it only happened on my stereo when playing copied / burned disc's, original cd's played fine on mine, if you are using original cd's and having this happen, try a lens cleaner disc to see if this helps.
Welcome to the club, hope you get your early setbacks sotred soon.