Johnny R Livingston , TN July 30, 2019 Appliance: Whirlpool 30" Built-In Electric Combo Sensor/Sc (Gold Line) GMC305PDS07 Whirlpool Oven Gmc305pds07: Microwave light bulb. How to replace Microwave Light Bulb. Replaced bulb after watching a couple of online repair videos. Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes