As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER ENGINE START, MASTER CAUTION REVEALED AIR CONDITION ANNUNCIATOR LIGHT WITH AUTO FAIL LIGHT AND GREEN ALTN LIGHT ON. ACFT GROUNDED. PERFORMED FIM 21-31, TASK 827. NR 2 AND NR 1 CONTROLLERS SHOW NO EXISTING FAULTS. NR 1 CONTROLLER FAULT HISTORY SHOWS LEG 00, FAULT CODE 101 SELECT PANEL LRU FAULT. PERFORMED GROUND TEST ON NR 1 CONTROLLER AND TEST PASSES. NO HISTORY 90 DAYS.