As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLIMBING TO FL350 PRESSURE CABIN CLIMB RATE WOULD CLIMB AND DESCEND BACK & FOURTH RAPIDLY TO A RATE OF 500FT TO 2,000 FT PROBLEM SEEMED TO INCREASE WITH FULL POWER CLIMBING TO FL370 AT LOWER ALTITUDES AROUND FL250 RATE WOULD PERIODICALLY CHANGE AT A RATE OF 200 TO 300 FT. GROUNDED - YES. REMOVED AND REPLACED SERVICEABLE RIGHT PACK FLOW SENSOR, OPS CHECK GOOD IAW B737-900 AMM 21-51-43-000-801 AND 21-51-43-400-801.