As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING A NR 2 ENGINE IDLE RUN, WITH ALL ENGINE BLEEDS OFF AND ISOLATION VALVE CLOSED, THE RT DUCT PRESSURE READ APPROXIMATELY 20 PSI. ACFT GROUNDED. FOUND THE NR 2 ENGINE BLEED AIR REGULATOR HAD FAILED. REMOVED AND REPLACED THE NR 2 ENGINE BAR IAW AMM 36-11-03-400-801, AND PERFORMED INSTALLATION TEST. TEST PASSED, DUCT PRESSURE NORMAL WITH BLEEDS OFF AND ISOLATION VALVE CLOSED. NO LEAKS NOTED.