Active Vent door broke off GE JVM3670

The active vent door atop my microwave (GE JVM3670) broke loose today. The black plastic grille subassembly behind the vent door fractured, releasing the small brackets that held the door on and connected it to the drive motor. Can I replace this grille subassembly myself, and where are instructions located?
THanks,
TDJONES1