As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
R/H PACK LIGHT ILLUMINATES WITH RECALL ON AFTER START CHECKLIST, EXTINGUISHES WITH MASTER CAUTION RESET. GROUNDED - YES. TROUBLESHOOTING USING BIT TEST REF B737-900 FIM 21-62 TASK 801 FOUND RIGHT TEMP CONTROL VALVE INOP. REMOVED AND REPLACED RIGHT TEMP CONTROL VALVE REF B737-900 AMM 21-51-10 OPS CHECK GOOD NO LEAKS NOTED. THIS CLEARS MEL 21-32B.