slide won't retract

It is almost always the gears or pins that break on slideouts. The motor seldom quits. You might be able to replace the broken part fairly easy, you might not.

One definite way of retracting is : --- : have someone inside pushing the button to retract (in case a tooth catches somewhere), and get a few guys outside and push push push. Then strap it shut with a ratchet strap and call the dealer for an appointment

Motor runs the shaft runs but must have a connection between the gear box and the slide,

Replace the broken sheer bolt maybe.

Not familiar with Jayvo slides, but it sounds like you sheared a pin. If so you need to turn the motor till the motor shaft and shaft are aligned then drive out Lord pin and replace. The next thing would be to look for a reason for it to break.

You should be able to crawl underneath remove a panel and use the supplied crank to manually retract the slide.