As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REF ASA DEFECTS #60449013. DURING T/S OF L/H PACK LT ILLUMINATED FOUND L/H ACM HARD TO TURN AND LOW AIR FLOW WHEN SELECTED HIGH. GROUNDED - YES. REMOVED AND REPLACED L/H ACM REF B737-900 AMM 21-51-04. REPLACED BROKEN CLAMP AND O-RING PACKING ON HIGH PRESS WATER SEPARATOR MIX MUFF REF B737-900 AMM 21-51-04. OPS CHECK GOOD. NO LEAKS NOTED. GROUND VERIFICATION COMPLETE. NO L/H PACK LIGHT ILLUMINATED.