I don't know what brand mirrors you have but several years ago I had a cracked mirror and I ordered a replacement (mirror only) and it came with instruction on how to remove the mirror from the assembly. I was able to repair it myself. My suggestion would be to Google the manufacture of your mirror and see if you can find instructions on taking it apart. They might have a phone number. The other thought would be to call your coach manufacture and see if they can supply you with instructions. Good luck with your project. Please report back with your fix because we all learn from each other.
Don & Bev Morgan Weyauwega WI, 05 Itasca Horizon 40KD, 400 HP Cummins, Delorme GPS LT 40, Toad 07 Saturn Vue AWD, Air Force One, TST 510 TPMS, Mayor of Weyauwega 2007 - 2013, Waupaca Co Board Supervisor 2010 - 2014