As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APU START BLUE MX LIGHT ILLUMINATED. SHUTDOWN APU, CHECKED OIL LEVEL - OIL LEVEL IS FULL, MAINT LIGHT WENT OUT, RESTARTED APU - NO LIGHT, BITE TEST SHOWS NO FAULT AND FULL OIL LEVEL NOW. ORIGINAL BITE CHECK SHOWED LOW OIL LEVEL. OK FOR SERVICE AT THIS TIME. TSR ISSUED. REPLACED APU OIL LEVEL SENSOR REF MM 49-94-11.