Jim,
The problem with mine was the guide jaw cracked and released the cable. I have read of other's success in finding the correct replacement part (just the guide jaw), but I was not that lucky, despite much net surfing and calling. I resolved the problem by using 2 part epoxy to glue the guide jaw back together, reinforced with a thick, liberal outside coat of JB Weld everywhere that would not interefere with the part's function. The reinforcing material covered almost all of both the plastic and metal parts of the jaw. I think I used two coats of the JB Weld.

As I recall, I loosened one of the bolts to relieve the cable tension while I did all that. I clamped the jaw to the guide rail to hold it together while the mess dried. I used plastic food wrap to ensure the jaw did not stick to the guide rail and masking tape to shield the cable. I then used a small, fine tooth file to smooth and clean up the part. It will need to cure fully because it must withstand a lot of stress. The entire torque of the window motor is applied to this part to hold the glass closed against the window frame. Be sure to lube the part with a good silicone slide grease when you reassemble, to minimize stress on the part. It took two tries to figure this out, but the second time has held ever since, although I must admit, I avoid using that window due to a lack of confidence.

Gather your patience because all this glueing and fussing around takes days to dry.

If this fix sounds improbable, realize you have nothing to lose. It will work or not. Purchasing the entire window regulator is quite expensive, well over $200.00 the last time I checked, more if it includes the motor. When I tried, I could not find the entire assembly in stock anywhere, regardless of cost. I came up with this fix before I could find a regulator assembly to purchase. Also, note this is a bad part to acquire from a junkyard because the plastic part of the jaw becomes brittle with age and they all suffer the same fate.

Best of luck Jim,
Darrell