As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TROUBLESHOOTING PER B737-900 FIM 21-33 TASK 802 FOR CABIN RATE OF CLIMB FLUCTUATION REF LP# 60269168 REQUIRES REPLACEMENT OF L/H PACK FLOW CONTROL & SHUT OFF VLV. GROUNDED - YES. REMOVED & REPLACED L/H PACK FLOW CONTROL & SHUTOFF VLV REF B737-900 AMM 21-51-01. OPS & LK CHECKS GOOD AT THIS TIME REF AMM 21-51-00.