You got an excellent deal on those! They re beautiful, and with the often missing badges, and the optional stands! I got mine for 125.00!
Before you attempt to remove the tweeter, giggle the plug on the crossover. Often the contacts need some deoxit, and tightening. Do this by carefully twisting the male prongs a tiny bit for good, tight contact. The pesky plug is often the reason the sound drops from the drivers. And yes, check all the fuses.
Yours are a little earlier than mine. Maybe built a couple weeks before.
Refinishing the cabs can become a bigger job than you would think. On mine, I did a very light block sanding with 220 grit just on the tops. Then applied a very light wipe with Watcos natural color Danish oil. Don't put on a heavy coat. That single application may be all you need to get them looking very good. The original finish is not oil, this is why I mentioned a very light oil wipe.
Congrats on your 910's' Bucket list speakers for many!
Cheers, Glenn