What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS NOT DECLARED DUE TO: RIGHT ENGINE FUEL FILTER BYPASS. LIGHT ILLUMINATED SHORTLY AFTER REACHING CRUISE ALTITUDE AT THE SAME TIME AS CENTER TANK REACHED ZERO FUEL. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT MIA. REMOVED AND REPLACED ENGINE NUMBER 2 FUEL FILTER (AALA202604215499) AND DIFFERENTIAL PRESSURE SWITCH (AALA202604214379), PER AMM 73-11-02 AND AMM 73-34-01. FOUND SERVO FUEL HEATER LEAKING, REMOVED AND REPLACED ENGINE NUMBER 2 SERVO FUEL HEATER (AALA202604213464) PER AMM 73-11-07. ALL OPS AND LEAK CHECK GOOD. ACCOMPLISHED GOOD ENGINE RUNS.