Here are the door codes:
M = MAIN DOOR OPEN
V = BILL VALIDATOR DOOR OPEN
L = LOGIC DOOR OPEN (This is the MPU switches. There are two switches in the MPU. One near the Compact Flash slots and one on the left side of the MPU)
B = BELLY DOOR OPEN
Since you are getting ALL these errors at once, there could be a couple of problems.
First thing I would try is to pull the MPU out, and put it back IN firmly. Sometimes a loose connection from the MPU and backplane can cause your door switches not to read properly... yes everything works, but it can only take a few pins not making contact to cause this error. If this machine was transported it could be the problem. This happened to me when I removed my MPU to add ram and a video card.
Second, Make sure all of your switches are plugged in and making contact so they close properly.
Check the MPU.. If locks were removed did the original owner zip tie the switches or are they open.
Let us know so we can help you.