@F14
Highly unlikely that 238 pax then sat about for 7 hours without attempting and succeeding in breaking down the door to the Flight Deck and/or communicating with ground via alternate means.... Confident there were at least 238 operational cell phones/tablets and other such devices on board.
More importantly and this is an answer a MH crew member would give as to what is the protocol followed by that carrier when one of the crew leaves the deck for a leak....
As in all accidents post the human tragedy it is important the cause is determined to avoid re occurrence.