Missing key in MM&M room 14710

[zipwin]

As aways, thanks for the help.

I've been in the rooms off the left-the one with all the levers and down below so I assume you mean some other place. I've also been all the way up and have all the coins and done those rooms (inside wall as well). I don't see any other clues in the left side wall-perhaps a hint in a PM will help.
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Dead Again,
zipwin