A B737-400 IN CRUISE AT FL350 DECLARED AN EMER AND DIVERTED DUE TO R WING BODY OVERHEAT WARNING AND MASTER CAUTION ILLUMINATED.

Narrative

WE WERE WORKING FLT ENRTE FROM ZZZ1 TO ZZZ3. AT LEVEL OFF THE MASTER CAUTION AND THE AIR CONDITIONING LIGHTS ILLUMINATED. LOOKING AT THE AIR CONDITIONING PANEL THE R WING BODY OVERHEAT LIGHT WAS ILLUMINATED. I CALLED FOR AND THE CAPT COMPLETED THE WING BODY OVERHEAT CHKLIST FROM THE QRH. THE LIGHT DID NOT EXTINGUISH EVEN AFTER ISOLATING THE R SIDE. IT REMAINED ILLUMINATED AND KEPT RESETTING THE MASTER CAUTION LIGHT. AT THAT POINT WE DECLARED AN EMER WITH CENTER AND REQUESTED AND LNDG AT ZZZ. DUE TO OUR ALT AND LOC; ZZZ2 AND ALL THE ARPTS IN THE AREA WERE EQUAL TIME AWAY. WE DECIDED ON ZZZ DUE TO THE MAINT FACILITIES; AREA MEDICAL FACILITIES; AND ZZZ RWY. WE LANDED WITHOUT INCIDENT; STOPPED THE ACFT ON THE RWY; AND SHUT DOWN THE NUMBER TWO ENGINE. EMER VEHICLES MET THE ACFT AND ADVISED US THAT THEY COULD NOT SEE ANY DAMAGE. WE THEN TAXIED TO THE GATE IN ZZZ. MAINT MET THE ACFT AND DISCOVERED TWO DIFFERENT PROBS. THE FIRST WAS A SMALL BLEED AIR LEAK LOCATED WHERE THE EXTERNAL AIR IS CONNECTED TO THE ACFT; AND ALSO IN ADDITION THEY DISCOVERED A FAULT IN THE DETECTION SYSTEM. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE PROB WAS CAUSED BY A SLIGHT PNEUMATIC LEAK ON THE AIRPLANE SIDE OF THE PNEUMATIC GND SERVICE CONNECTION. THE RPTR SAID A PORTION OF THE FORWARD KEEL BEAM SENSOR LOOP WAS FOUND IMPROPERLY POSITIONED 12 INCHES FROM THE LEAK AND WAS REPOSITIONED TO THE CORRECT LOCATION.