As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MIA INFLIGHT T963/26OCT DFW TO GRU - LEFT ENGINE PRESSURE RELIEF VALVE EICAS STATUS MESSAGE ILLUMINATED AT FLIGHT LEVEL 300. LANDED MIA WITHOUT INCIDENT. FOUND GROUND WIRE CHAFING WITH STUDS AT NUMBER ONE ENGINE PRESSURE RELIEF VALVE. REPLACED GROUNDING WIRE AND PRESSURE RELIEF VALVE. SYSTEM GROUND CHECKED NORMAL OPERATION.