As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU GENERATOR DROPPED OFF LINE. AFTER SEVERAL RECALLS IT INDICATED NORMAL FREQUENCY & VOLTAGE. ACFT GROUNDED. ACCOMPLISHED APU BITE CHECK CURRENT STATUS NO FAILURE FOUND. APU OIL LEVEL AT FULL . APU OPS CK NORMAL. PERFORMED FIM TASK 24-21, TASK 820. OPS CK NORMAL.