As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING AFTER START CHECKLIST AFTER PRESSING RECALL WE GOT A #1 PACK LIGHT THAT RESETS WITH MASTER CAUTION. GROUNDED - YES. BITE TEST HAD "TCV" FAULT. VALVE WAS REPLACED LESS THAN 90 DAYS AGO. HISTORY OF THIS. REPLACED CONTROLLER PER B737-800 AMM 21-61-20/401 AS PRECAUTIONARY. OP CHECKS GOOD.