Selling Back to Patagonia

Curious to your alls experience selling items back to Patagonia in store? I don’t have one in my city, but I’m taking a trip and will be near one. Couple specific questions I had in mind-

Is there a limit to how much you can trade-in at once? We have a ton of clothing.

I have an older jacket (1990) and I’d like the zipper repaired - is that still covered under the warranty or am I really stretching it? I’m assuming I’ll still pay shipping to have it mailed back.

Any other experience or anecdotes welcome!