What was found
DURING CRUISE FLIGHT, F/O PITOT LIGHT ILLUMINATED FOUND THAT CB OPEN, LABELED F/O PITOT HEATER P18,3,D5. ACFT GROUNDED. REPLACED F/O PITOT PROBE IAW 34-11-01-400-801 AND LEAK TEST OK, REFERENCE 34-11-00-740-811. PROBE HEAT CHECKS GOOD REF 30-31-00-730-801.