Low-temperature grease application
For cold-related binding, it usually means re-lubricating the track and rollers with a grease rated for low temperatures, since standard lubricant is part of why the problem showed up in the first place. For opener and sensor issues, it's testing the circuit board, checking the sensor alignment down to the degree, and confirming the safety reverse actually works before we call the job done - that last check matters more in winter when ice on the sensor eye is a real possibility.