That's a cool old guitar you have there, Tom. Welcome to the Club. There's not a ton of information about them here, but probably more than anywhere else. As I understand it, these models with the electronics cavity routed to the front and the controls mounted a brass plate were made for export to Japan. Consequently, we don't see as many of them back here.
I believe the controls should have been like any other Distillate: Volume and lowpass Filter (the two knobs) and; 2-position Q-switch, Treble boost/flat/cut, Bass boost/flat/cut (for the three switches) Plus a 1/4" mono output jack. (and that cool little battery-draining LED...)
The good news is; Alembic electronics are modular, no soldering required, so if you can find a set, it's a simple matter to install them and plug them in. The bad news; this might be the proverbial search for hens teeth. A call or email to Mica is your best bet for some appropriate replacement parts. Distillate is an inactive model, but there are some similar controls they can fix you up with. Being mounted on that plate should make it a piece of cake!
Again, welcome- that really is a sweet old guitar... it'll bring you many years of joy if you get her fixed up. I've been watching another one like it on ebay that was modified in an interesting way.
Good Luck!