No, I would not send it in until there is a problem, since it is the gimbal all that can happen is that the camera will not work, it won't make the AC fly away or crash, so it's not a big problem
I would do a full camera calibration to make sure everything is back to normal, might have just been a problem with the water you mentioned from the crash.
I would also do a IMU calibration and check the compass readings for higher interference
Have a look in the engines as you said the propellers were broken of some of the plastic tabs from the propeller mount might be in the engines. If you have compressed air or canned air, I would give the Mavic a bit of a spray with air to clear away any crash debris.
Check if there is any abnormal play in the legs, hopefully they are still rigid when opened and that there is no vertical movement.
Just to be sure, refresh the firmware and reset the AC to factory setting via the DJI Assistant 2 app on the PC, I would also re-link the RC to the AC
And if there was a lot of water, I'd let it dry out some more before flying again