Look below for your what your three MSV messages signify...>>>
Closure B Lower Door was closed. No action required. Error clears after one game is played.
Closure D Drop Door was closed. No action required. Error clears after one game is played.
Closure L Logic Door was closed. No action required. Error clears after one game is played.
Closure M Main Door was closed. No action required. Error clears after one game is played.
Closure P Accessory/Top Box Logic Door was closed. No action required. Error clears after one game is played.
Closure S Bill Acceptor Cashbox Door was closed. No action required. Error clears after one game is played.
Closure T Accessory/Top Box Main Door was closed. No action required. Error clears after one game is played.
Closure V Bill Acceptor Door was closed. No action required. Error clears after one game is played.
I think you need to open the door, and press the Diagnostic button, to get some other possible messages than "Closure MSV"?