As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PACK LIGHT ILLUMINATED AFTER ENGINE START RESET WITH MASTER CAUTION RESET. TROUBLESHOT LEFT PACK SYSTEM PER FIM 21 53 00 810 AND BITE CHECKED SYSTEM PER AMM 21 61 00. RAN PACK USEING APU. PACK LIGHT NEVER ILLUMINATED. COULD NOT DUPLICATE DISCREPANCY.