As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SPLIT PACK DUCT PRESSURE IN CRUISE FLT 350- RT, PACK UNDULATING 22PSI, LT PACK INDICATING 41 PSI. ACFT GROUNDED. ACCOMPLISHED NR 2 ENGINE BLEED AIR SYSTEM HEALTH CHECK IAW TASK CARD NG-36WC-00001. R & R NR 2 ENGINE PRSOV REF AMM 36-11-04. OPS AND LEAK CHECKS GOOD. R & R NR 2 ENGINE PRECOOLER CONTROL VALVE REF AMM 36-12-02. OPS AND LEAKS GOOD. PERFORMED ENGINE BLEED AIR CROSSOVER OPS TEST REF AMM 36-11-00-710-801. OPS TEST GOOD.