A very concerning time for all on board, plus loved ones on the ground. Certainly not an enviable position to be in. However, the outcome is good in that all survived the ordeal unscathed thanks to the skill of the pilot.
Not being familiar with type. It would seem that there is no other means of manually lowerering the gear, or it would have been used?
It will be interesting to know the cause which will no doubt be revealed in time.
Aircraft can always be repaired or replaced, not so, those on board in most cases.