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The maintenance tunnel key is found in the Maintenance Tunnel Warehouse in Dead Rising. The key allows Frank to access the Maintenance Tunnels through the maintenance doors around Willamette Parkview Mall. According to Otis's call, the first time Frank enters the maintenance tunnels, the key is a spare which Otis left.
Retrieving the keyEdit
Drive into the tunnel and head for the middle dead end to find a door that leads to a warehouse. From the parking lot entrance:
|Take the first right|
|The next left|
|Then make a right|
|Reach the door.|
In the very back right of the room, the maintenance tunnel key will be rotating just above the ground. This key allows Frank shortcuts through the different plazas of the mall by traveling underground. The key is not required to complete the game, but it makes the final cases much easier to complete.