We have a convection micro. On my last unit (same type micro), we managed to actually melt the plastic trim by trying to heat something from frozen to 165 degrees....just really dumb. We should have thawed it first! Anyway I ordered new trim and went to pull out the micro to take the door apart and replace the trim. After several hours, I finally called in an appliance expert. He didn't care that it was in my RV. He works on them all the time. In five minutes he had the door off and had it on my counter. 5 minutes after that the pieces were out, and he pulled the new ones from the box I gave him. Swapped right in, no problems and he was done in less than 30 minutes. He showed me where all the hidden screws were...it was fun to watch. I'm not even sure I could do it again today! It was worth the $55 service call to have him take care of it! Best of luck.
'07 Holiday Rambler Endeavor PRQ ("Elvis"), and our 2012 CRV toad