If you're somewhat handy and want to do the work yourself, you can order an Accuslide cable assembly kit from Amazon for $27.70 with PRIME delivery, you'll have it Wednesday.
https://www.amazon.com/BAL-22305-Cab...y&sr=8-1-fkmr0
If you want a dealership to replace it, by the time you schedule an appointment, they get it checked, call you for repair authorization, order the parts, get them in, reschedule your trailer into the shop, do the repair work, adjust the other slide cables, move it around the lot several times (into and out of the shop) hopefully they won't have hit anything or damaged the trailer, and don't forget that your batteries will be dead unless you make provisions to keep them charged.....
Alternatively, you might find an independent RV repair service that would do it for you. Either the dealership or an independent service will charge by the hour, probably $125/hour, so you're looking at 2 or 3 hours work and up to a month or more without your trailer......
Anyway, the replacement cable is available, cost less than $30. It's up to you whether to tackle it or leave it to the dealership......