Chi,
For 106, is SKD1 on? 106 could be a loss of a 3 phase (single phasing or low voltage). It may also be a loss of 115vac crip input for your safety string.
Now I'm guessing that if 106 shut down your unit down the car wouldn't be able to relevel. I suggest turning the unit off, putting gauges on and shut the oil supply line. See if the car drops down or if you lost pressure in the valve.
