Welcome to Beoworld!
Forgive my asking, but what is the matching CD player?
I have a lamp and capacitor kit from Martin/Dillen that I never did use if you want to try replacing the lot on your own.
"Several hundred dollars" sounds high. $150 to $250 would not surprise me, though. Benny Amina will charge you a bench fee of $50 in advance to look at it, then call you with a repair cost after diagnosis. He's fixed my Beogram 4002 and Beomaster 4000, and I've purchased a retipped MMC4, all with excellent results.
There are at least three other Beoworlders that I know of in Ohio. If you're near Columbus, you may have local help (at least moral support) available.
Current primary listening: SMMC20EN -> BG4002 -> BM4000 -> Beovox M70