As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMBOUT, HYDRAULIC PRIM 1 EICAS MESSAGE AND PRESSURE LIGHT ILLUMINATED ON C ELEC 1 PUMP. SWAPPED NR 2 ELCU FROM C2 SYSTEM TO NR 1 C1 SYSTEM POSITION SN NR 2 SWAPPED TO NR 1 3B41-3B-09211. ON POSITION NR 2 INSTALLED NEW ELCU IAW AMM 29-11-14. SYSTEM CHECKED OK.