My advice. Run. As fast as you can. I’m not kidding.
I had the exact problem with the tape transport on my GL2 last year. I called around, looking for a validated repair facility. However, Canon doesn’t validate repair shops. You have to call customer service and send the camera back to one of the two factory service centers.
I sent the camera back, to have the transport repaired. When the camera was shipped back to me, the transport was repaired, and worked fine. However, it was now stuck in card mode, and refused to record to the actual tape. I sent the camera back a second time, after calling. Since Canon screwed up, they offered to fix it for free.
When I received the camera back from the second repair, it worked for about a week. The transport wasn’t working again. I had spent about $400 for the original repair, and now I was back to the original problem. When I called the service center a third time, they claimed to have replaced both the circuit board and the tape transport, and refused to fix it for free, even though they still hadn’t solved the original problem. On top of this, they actually had the tenacity to blame me for the problem.
To keep things short, it got ugly. I had to call a local customer service bureau, who threatened them with a lawsuit. Needless to say, they fixed it at no cost.
Sorry to be a downer.