The crown and pusher seals are checked and in this case, all are fine. If they are not, the pusher seals can be changed to return water resistance in most cases but, crown seal deterioration requires a new crown.
The case and bracelet are cleaned and the movement re-fitted to the case.
Then the dust cover.
A new case back seal is fitted and the case back tightened down. With the bracelet re-fitted, the watch is finished and now goes into testing.