As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 LEFT BLEED TRIP OFF LIGHT CAME ON DURING CRUISE AT 400 RESET AND RE-TRIPPED 2 MINUTES LATER AND WOULD NOT RESET. REPLACED PRECOOLER VALVE REF MM 36 12 02 000 400 801. REPLACED HIGH STAGE REGULATOR REF MM 36 11 07 000 400 801. COMPLETED ENG BLEED AIR SYSTEM HEALTH CHECK REF MM 36 11 00 700 801 (17) I(4) ALL CHECKED GOOD. COMPLETED FIM TASK 36 10 00 810 801 REPAIR CONFIRMATION. GROUND VERIFICATION SUCCESSFUL.