Dear Mr. [deleted],
A resident getting stuck in the elevator for 15 minutes during power failure shows that the emergency escape device has failed. As you had informed us before, whenever there is a power failure, battery in the emergency escape device takes over to immediately bring the elevator down to the next lower floor and opens the doors to enable the passengers to come out of the lift without waiting for resumption of main power / backup generator. I have seen that this works well in other lifts but seems to have failed in this elevator in OAK-C. This needs immediate isolation & attendance by Mitubishi Service Engineer to avoid any mishap.
Best Regards
[deleted]
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