As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PACK LIGHT ON RECALL DURING AFTER START CHECK. EXTINGUISHED WHEN MC PRESSED (PRIMARY OR SECONDARY CONTROLLER FAILURE). GROUNDED - YES. BITE OF LPFTC SHOWS TEMP CTR VALVE FAULT WITH CODES 21-51264 AND 21-51267. ACCOMPLISHED B737-900 FIM 21-53 TASK 803. FAULT SELF RESTORED & OPS NORMAL.