RQDX3 DEVOFFLINE Problems

I have a MicroVAX II in a BA123 enclosure and I am experiencing some problems getting it to see the RD53. Whenever I try to boot I just get the error DEVOFFLINE and the Ready light on the front panel goes out when this happens (you can't get it to switch on again if you press the button a few times). The RD53 is known to work as it will boot in a MicroVAX 2000. The RQDX3 also works as I have tested it in a working MicroVAX II (BA23). I have tested the cable from the RQDX3 to the M9058 distribution board. I have also tested the cable from the M9058 to the front panel. I have tested the front panel button and it seems to be right (it shorts two terminals when depressed, leaving the Open Circuit when it is out). I have swapped the cables from the distribution board to the drive with another set. I am starting to suspect that the M9058 is at fault, I don't have a spare to eliminate this component, but I was wondering if anyone else has seen this problem and has any suggestions. Thanks Rob