Hi Nick,
Here is an RV Mobile in Everett; Address: 11715 Highway 99, Everett, WA 98204, Phone: (425) 355-1170, possibly they can come out and help you with your slide.
Here is another one I found in your area: All RV Repair, 1038 Cedar Ave, Marysville ยท (360) 659-3912.
We use All Mobile RV Service in Tacoma, and Paul Walters comes up to Renton and does an excellent job for us. However, I checked with them this morning to see if they come up to Everett, unfortunately, they do not.
Goggle and search for rv repair service in Everett, WA and you find a lot of places that can assist you in your area.
Good Luck,
Anita Johnson