As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PACK LIGHT ILLUMINATED ON RECALL. LEFT PACK LIGHT EXTINGUISHES WITH MASTER CAUTION RESET. GROUNDED - YES. TROUBLESHOT IN REFERENCE TO B737-800 FIM 21-53. PACK OPS CHECKS GOOD. COULD NOT DUPLICATE DEFECT. AIRCRAFT RELEASED FROM MEL 21-32B.