As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING TASK CARD NG-36WC-00001, FOUND MASSIVE AIR LEAK AT FWD PART OF HSR, SO BAD THE HSV WOULD NOT MOVE ON THE #2 ENGINE. GROUNDED - YES. REMOVED AND REPLACED THE #2 HIGH STAGE REGULATOR IAW B737-900 AMM 36-11-07/401. ETOPS GROUND VERIFICATION SUCCESSFUL.