flatfish, welcome to iRV2.com. We are glad to have you join us here and look forward to reading of your adventures and experiences. I am sure you will like both it and the forum.
You should be able to take the bad bulb to most any auto parts store for a replacement. If you have difficulty in finding the right bulb they should have a source to check. You will find we are a group of fun loving RVers that like to help each other where we can. If you have any questions just ask. Good luck and take care.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7