The bias figures are not readable. My best guess for the GBX,GBY, GBZ values are: GBX: 7770 3600 GBY: 0015 2200 GBZ: 0010 0000. For info bias figures are between 7765 0000 and 0024 0000. Remembering that these are octal values with the middle figure being 0000 0000.
If the unit turns on, the first thing I would do as an absolute priority is to get the bias figures from the core memory. Procedure is:
MSU to Stby (remove small grey cover from msu - 2 scews). Turn rotary knob to bias. The write down the bias figures as shown on the CDU. CDU rotary knob should be in 'Pos' and wpt thumbwheel at 0
GBX (wpt 0)
GBY (wpt 1)
GBZ (wpt 2)
SFX (wpt 3)
SFY (wpt 4)
SFZ (wpt 5)
Once you have these figures written down you then have some sort of insurance policy against memory wipes.
Turn bias switch back to 'off' and you can then switch msu off or continue to align.