Any time I have seen a 70007 on the display, I wound up having a LSI-11 issue. Pull it out, clean the edge connector with a soft eraser, put it back in, make sure logic supply is good. Make sure after you power up that you use the reset toggle switch behind the plexiglass. Do a google search for Digital Equipment Corporation and LSI-11 and see what comes up. Maybe some user groups. DEC called it a KD11L module.