As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER ENGINE START RIGHT PACK LIGHT ILLUMINATED WENT OUT WITH MASTER RECALL. GROUNDED - YES. ACCOMPLISHED B737-800 FIM 21-53 TASK 820. FOUND TCV FAULT. REMOVED AND INSTALLED NEW RIGHT TCV PER B737-800 AMM 21-51-10/401, INSTALLATION TEST PASSED. NO FAULTS FOUND. GROUND VERIFICATION SUCCESSFUL.