As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LT DUCT PRESS LOW ON CLIMBOUT AND CRUISE. ACFT GROUNDED. ACCOMPLISHED NR 1 ENGINE BLEED AIR SYSTEM HEALTH CHECK REFERENCE TC NG 36WC-00001. R & R NR 1 ENGINE BLEED AIR REGULATOR IAW AMM 36-11-03-400-801. PERFORMED GROUND VERIFICATION IAW AMM TASK 36-11-00-710-801. ENGINE BLEED AIR CROSSOVER OPS TEST, TEST SATISFACTORY. NO DISCREPANCIES NOTED. GROUND VERIFICATION SUCCESSFUL.