Bose AW-1 Acoustic Wave System - Tape and Tuner Both Dead

I've wanted one of these since they came out in the 80s, so I bought the cheapest and most broken one I could find. Only the line-in works on this thing. Am I going to be able to do anything with it, or is it better as a parts unit?

These units were, in my opinion, among the first boomboxes to ever take sound quality seriously. The first AW-1 units rolled off the line in 1984 and were quickly superceded by models that featured CD players and even Minidiscs for the Japanese market.

Belts required:
Capstan: 248mm IC (79mm dia) x 4mm
Take-up: 140mm IC x 1mm
Supply: 178mm IC x 1mm

Pinch roller: 13x8x2.5mm
Playback idler: 13mm OD x 9mm ID (estimated) x 2mm thick

A square profile AS568 #109 o-ring MAY work for an idler if you can find one, but may need to be shaved down in height to fit. Mine isn't bad so it's not getting replaced.

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Camera gear I use:
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0:00:00 - Intro
0:06:00 - Checking operation
0:10:07 - Getting inside the unit
0:12:57 - Diagnosing the dead tuner
0:31:31 - Begin cassette transport service
0:34:00 - Checking and measuring belts
0:40:10 - Servicing the belt side of the transport
0:52:26 - Examining the reel drive assembly and cleaning the playback idler
1:06:03 - Measuring the playback idler
1:12:56 - Measuring the pinch roller
1:22:29 - Proper orientation of the pause leaf switch
1:25:41 - Capstan motor problems, pinch roller beyond help
1:29:38 - Diagnosing the B+ power supply issue