Narrative:

During cruise the TR#1 C/B popped followed by electrical fumes. Emergency declared with a request for an immediate turn to the nearest suitable airport. ATC provide immediate turn for ZZZ. During the diversion the fwd cargo fire light illuminated - fwd bottle discharged.

Google
 

Original NASA ASRS Text

Title: B737-400 ENCOUNTERS POPPED CB AND SUBSEQUENT ELECTRICAL FUMES DURING DIVERSION TO NEAREST SUITABLE ARPT; ALSO RECEIVED A CARGO FIRE WARNING.

Narrative: DURING CRUISE THE TR#1 C/B POPPED FOLLOWED BY ELECTRICAL FUMES. EMER DECLARED WITH A REQUEST FOR AN IMMEDIATE TURN TO THE NEAREST SUITABLE ARPT. ATC PROVIDE IMMEDIATE TURN FOR ZZZ. DURING THE DIVERSION THE FWD CARGO FIRE LIGHT ILLUMINATED - FWD BOTTLE DISCHARGED.

Data retrieved from NASA's ASRS site as of January 2009 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.