If you can find a repair shop, they will typically charge a minimum diagnostic fee. Expect to pay $60-$120 to get your receiver fixed, perhaps less and quite possibly more.
As KEW mentioned, you may be able to get up and going for less with used gear.
If you decide to go new, take a look at the HK3490, a great performing two channel receiver (with digital inputs, a nice feature) in the $500 range. Such an item would keep you happily in the music for another 25 years. Here's a link:
http://www.audioholics.com/reviews/receivers/hk-3490
I realize that you like your current speakers, but I was wondering if you are using the two sets simultaneously, as that could have stressed your receiver a bit much. (The HK I linked to has a pretty robust amp section and would probably not have any issues driving both, but I can't say for sure.) Also, running two sets of stereo speakers in the same room is a recipe for poor sound, but I'm not sure if you do that. How exactly do you listen to your system?