As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT PACK LIGHT ILLUMINATED ON CLIMBOUT. RAN CHECK LIST PACK LIGHT RESET, OPS NORMAL THEREAFTER. GROUNDED - YES. ACCOMPLISHED B737-900 FIM 21-53 TASK 820 STEP 820A- F2A2, NO DEFECTS FOUND. PER FIM 21-53 TASK 820 REMOVED AND REPLACED RAM AIR EXHAUST ACTUATOR, OPS CKD GOOD, REF B737-900 AMM 21-51-27.