[GRC]

I'm sure you can find online guidance on how to clean it. Honestly, it's not rocket science.

Essentially, head cleaning fluid on a Q-tip, applied to certain strategic areas (not the rubber pinch wheel - there's special cleaner for that)

Again, ask here if you want some guidance. Don't just send it to a local dealer without any indication that they specialise in open-reel or have some credentials that they've dealt with servicing them before.

When you power the deck up for the first time, run it for a bit without a tape in place. Select fast forward, rewind a few times. Select Play. Clean it thoroughly first, and frequently. I'll post more later.