What was found
JAX - FLT 1023 - EN ROUTE FROM PHL TO MIA, CREW REPORTED THE RIGHT PACK TEMPERATURE INDICATION READ 200 DEGREES ALL THE TIME. CREW ALSO REPORTED THE UPPER ANTI-COLLISION BEACON CIRCUIT BREAKER WAS FOUND OPEN AND WHEN AN ATTEMPT TO RESET THE BREAKER WAS ACCOMPLISHED, THE BREAKER RE-OPENED CAUSING SMOKE TO APPEAR IN THE PASSENGER MID-CABIN. FLIGHT DIVERTED TO JAX AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REMOVED AND REPLACED THE RIGHT PACK TEMPERATURE BULB (P/N MS528034-1). OPERATIONAL CHECK OF RIGHT PACK NORMAL. MAINTENANCE DETERMINED THE SMOKE TO COME FROM A FAILED UPPER ANTI-COLLISION BEACON. OPERATIONAL CHECK NORMAL. (X)