Refurb GAS Grandson amp or put money towards another amp?

I’ve got a vintage GAS Grandson amp that I use in my Zone 2 system to drive a pair of Snell QBx monitors. The Grandson was a garage sale find about 30 years ago. I had some work done at the time before I put it in operation, but it was so long ago, I can’t remember what was done.

The Grandson is now having some issues. Significant distortion in the left channel and the left channel cuts out completely at times. My question now is it worth it to get the amp refurbished? Or am I better off spending the money on another used amp? If so, what would you recommend? How much would be a reasonable amount to invest refurbing the Grandson?

I’m one of many who have champagne tastes, but a beer budget, at best. I’m not looking for audio nirvana (given my finances), but want to get the best bang for the few bucks I do have to spend. I’m ballparking around $200, as I think I can find a Rotel amp or receiver for around that much. But would a Rotel be a step down as compared to a well-functioning Grandson?

Anyone familiar with the Grandson? From what I understand the Ampzilla was highly regarded in its day, and the Son of Ampzilla and the Grandson amps were well regarded, too, just not as high end.
Btw, my Grandson is the model with meters, though the lamps have been burned out for many years.