B767-300 and 300 ER
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 100; Flight Crew Total 19000; Flight Crew Type 5500
Aircraft Equipment Problem Critical
Flight Crew Diverted; General Maintenance Action
Aircraft
[I] received a CARGO BTL 1 EICAS and a DISCHRG light on the cargo fire panel. [I] followed the very lame QRH; which offered no guidance or explanation. [I] looked in the Flight Manual under systems for a better idea of the problem. Called Dispatch and Operations Center; and it was agreed we needed to deviate to have the problem repaired before going into ETOPS airspace. Landed about 4;500 LBS overweight...smooth touchdown; had Maintenance inspect...also as a precaution; the Fire Personnel followed us to the gate. Maintenance discovered a loose cannon plug on the pressure gauge of the number one bottle. Cleared the MRD and continued.
B767-300 Captain reported noticing an EICAS CARGO BTL 1 and DISCHRG light on; triggering a divert for maintenance action before they committed to their international over water leg.