As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE HAS THE L BLEED OFF EICAS MSG AND L-BLEED OFF LIGHT ON WITH BLEED SELECTED. REPLACED ISOLATION BYPASS CHECK VALVE. FOUND DIRECT SHORT AT PRSOV CONNECTOR. FOUND D22 CONNECTOR ON PRSOV BAD. REPLACED SAME. OPS CHECKED GOOD. REPLACED PRSOV. LEAK & OP CHECKS GOOD.