As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT PACK ILLUMINATED AT 9000 FEET, MASTER CAUTION SYSTEM RESET, NO FURTHER PACK LIGHT. GROUNDED - YES. NOTICED R/H RAM AIR DOOR STUCK IN FLIGHT OPEN POSITION ON WALK AROUND, ACTUATOR HUMMING LOUDLY. BITE CHECK CONFIRMS R/H RAM AIR DOOR. REMOVED RH RAM AIR INLET DOOR ACTUATOR REF B737-900 AMM 21-51-21. OPS CHECKED GOOD.