As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SATCOM VOICE. ACCOMPLISHED MM23-25-00 FAULT ISOLATION. 'HGA HPA INACTIVE' DISPLAYED ON CDU. VERIFIED POWER AT HPA. M1782, HGA HPA HAS 'POWER SUPPLY FAULT' LIGHT ILLUMINATED. REPLACED HPA PER MM. TESTED SYSTEM PER MM, OPS CHECKED NORMAL.