As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING MASTER CAUTION RECALL FOR THE DESCENT CHECKLIST, NOTE LEFT PACK LIGHT WAS ILLUMINATED. LIGHT EXTINGUISHED UPON RESET OF THE MASTER CAUTION SYSTEM. GROUNDED - YES. PERFORMED B737-900 FIM 21-62 TASK 801 PACK TEMPERATURE CONTROL BITE PROCEDURE. PERFORMED BIT AND PREV FLT SWITCH TEST, FAULTED RAM AIR ACTUATOR. ON VERIFY SWITCH TEST, NO FAULT. RESET FAULT MEMORY. RAN BITE PROCEDURE SECOND TIMES, NO FAULT. NO PREVIOUS FAULT HISTORY, L/H PACK OPERATE NORMAL.