Motor component diagnosis method
We pull the cover, check the circuit board for burn marks or a swollen capacitor, and run the motor unloaded to hear whether it's the gearbox grinding or the motor itself struggling. If it's a full replacement, we size the horsepower to the door - a heavier insulated steel double door needs more motor than the half-horsepower unit that came with a lighter original door, which matters a lot in this area given how many houses have had their original doors swapped out over the decades.