What was found
AFTER TAKEOFF AND SELECTING GEAR UP, RED "UNSAFE" AND AMBER "HYD PRESS" LIGHT REMAINED ILLUMINATED. AFTER APPROX 1-2 MINUTES A LOUD THUMP WAS HEARD FROM THE LT MAIN GEAR. THE "HYD CONTROL" CIRCUIT BREAKER WAS PULLED IAW ABNORMAL CHECKLIST PROCUDURE. WHEN CIRCUIT BREAKER WAS PULLED, THE LT MAIN EXTENDED WITH A LOUD THUMP, AND THE LT GREEN DOWN/LOCKED LIGHT ILLUINATED. RESET THE "HYD CONTROL" CIRCUIT BREAKER AND SELECTED GEAR DOWN, AND RECEIVED THREE GREEN & NO RED. REPLACED LANDING GEAR CONTROL PCB, UPLOCK HOOK ASSY, AND SPRING IAW MM 32-30-05. OPS CHECKED GOOD IAW MM 32-01-00, 32-30-00, & 32-90-10.