As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE FLIGHT JUST BEFORE DESCENT WHEN MASTER RECALL WAS PUSHED AIR COND AND LEFT PACK LIGHT ILLUMINATED AND REMAINED ILLUMINATED UNTIL MASTER CAUTION PUSHED AIR COND AND PACK LIGHT EXTINGUISH. GROUNDED - YES. REMOVED AND REPLACED RAM AIR ACTUATOR REF B737-800 AMM 21-51-21.