As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT PACK LIGHT ILLUMINATED DURING TAXI OUT, RESET WITH MASTER CAUTION RESET. ACFT GROUNDED. ACCOMPLISHED BITE TESTS ON BOTH CONTROLLERS IAW TASK 21-61-20-860-005. NO FAULTS FOUND ON PREVIOUS FLIGHTS. BOTH CONTROLLERS PASSED. RAN PACKS FOR 10 MIN. NO FAULTS.