Document the symptom from a safe position
Uneven movement, reversal, noise, damaged panels or operator problems are useful descriptions.
Do not adjust high-tension components
Springs, cables and counterbalance systems can store substantial energy.
Separate door and operator issues
The moving door assembly and powered opener can have different service needs.
Ask about inspection of related wear
A repair may be a good time for a qualified technician to assess hardware that works as a system.
Safety boundary. General planning information only. Do not open, dismantle or work on hazardous electrical, gas, structural, fire-protection or contaminated-water systems unless you are appropriately qualified and authorized.