In plain words
The visit runs in a settled order. On the phone you describe the lock, the door, whether an opener is fitted and whether the lock is currently jammed. On site the opener is disconnected, the door is closed by hand and checked for level. The lock is then examined piece by piece: handle, spindle, centre mechanism, bars, guides, cylinder, fasteners and the track slots. Adjustments are made first, worn parts replaced second, and the lock is cycled from both sides with the door shut. Finally the opener is reconnected, the door runs full cycles, and you are shown how the lock and the opener are meant to be used together.