As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PERFORM HEALTH CHECK ON NO. 2 ENG BLEED AIR SYS PER FOLLOW UP REPORT OF RIGHT BLEED PRESSURE FLUCTUATING. GROUNDED - YES. FOUND NO. 2 ENG HIGH STAGE REGULATOR AT FAULT PER T/C NG-36WC-00002-2 STEP 04(L). REMOVED AND REPLACED HIGH STAGE REGULATOR PER B737-900 AMM 36-11-07. OPS CHECK GOOD.