A319 FLC DIVERTS AND LANDS IN EMER CONDITION DUE TO AN AVIONICS SMOKE WARNING ALARM.

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WHILE CRUISING AT FL250; GOT 'AVIONICS SMOKE WARNING.' THIS REQUIRED LNDG ASAP; SO WE DIVERTED TO RDU ARPT -- ALMOST DIRECTLY UNDERNEATH US. WHILE WE DSNDED; WE DID THE EMER CHKLIST. A NORMAL LNDG WAS MADE ON RWY 5R. MAINT DETERMINED IT WAS A FALSE WARNING; AND REPLACED THE AVIONICS SMOKE DETECTOR. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR ADVISED THAT THE FLC COORDINATED THE PROB WITH ATC; DONNED THEIR OXYGEN MASKS; AND EFFECTED AN EMER DSCNT. MAINT LATER ADVISED THAT THE COMPUTER COMPARTMENT VENTILATION COMPUTER AND SMOKE DETECTOR WERE REPLACED; BUT IT WAS NOT IMMEDIATELY EVIDENT WHICH EQUIP HAD FAULTED. IN DISCUSSION WITH OTHER PLTS; NONE HAD ENCOUNTERED THIS PROB. BEING IN THE VICINITY OF AN ARPT ACCEPTABLE FOR THEIR SIZE WAS A PLUS; BUT THE RPTR STATED THAT THE CHKLIST WAS A REAL CHALLENGE TO COMPLETE PRIOR TO LNDG -- ESPECIALLY SINCE THE CHKLIST REQUIRED A NUMBER OF COMPUTER UN-PWR AND RE-PWR STEPS. RPTR WAS ADVISED BY MAINT THAT THE EQUIP COMPARTMENT VENTILATION COMPUTER 'HAD BEEN CHANGED OUT RECENTLY' BUT CIRCUMSTANCES WERE UNKNOWN.