Jack G Santa Clara , CA November 08, 2015 Appliance: General Electric Microwave PVM1790DR1BB Ge Microwave Pvm1790dr1bb: The plastic tabs for the screws that hold the plastic grill in place on my convection/microwave oven somehow broke off and the grill needed to be replaced. How to replace Grille Bb. I ordered an exact replacement from Appliance Parts Pros and, when it arrived, removed the two screws from the top of the oven where the tabs are located, removed the broken grill, and installed the new grill. Took all of five minutes. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes