As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DESCENDING THRU 10,000 MASTER CAUTION ILLUMINATED WITH AUTO FAIL LIGHT ON PRESSURIZATION PANEL ACCOMPLISHED QRH AND WORKS NORMAL IN ALTN MODE. NO UNUSAL INDICATION NOTED WITH RATE OF CLIMB OR CABIN DIFFERENTIAL. ACFT GROUNDED. REF FIM TASK 21-31, TASK 801 PERFORMANCE CPC BITE TEST ON CONTROLLERS 1 & 2. NO FAULTS FOUND IN CURRENT FAULT HISTORY. AUTO FAIL LIGHT AND ALTN LIGHT EXTINGUISHED. BITE TEST PASSED.