What was found
ON LANDING, LANDING GEAR WOULD NOT EXTEND, CB F7 POPPED, RESET AND GEAR CAME DOWN. MAINTENANCE JACKED AIRCRAFT AND SWUNG GEAR, ALL CHECKS GOOD. AS A PRECAUTIONARY MEASURE MAINTENANCE REPLACED THE LANDING GEAR CONTROL UNIT PN D494-12-001. ALL WORK DONE IAW SF340 MM 32-31-05.