As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LT PACK LIGHT IS ILLUMINATED. EXTINGUISHES ON RECALL. GROUNDED - YES. PERFORMED PACK/ZONE TEMPERATURE CONTROLLER BITE TEST REF B737-800 AMM 21-61-00-700-806-002 ON BOTH PACK ZONE TEMP CONTROLLERS, NO FAULTS FOUND ON BITE, PREVIOUS FLIGHT OR VERIFY TESTS. OK FOR CONTINUED SERVICE.