What was found
ON TAKEOFF, INTIAL GEAR RETRACTION WAS NORMAL. 3-5 SEC LATER DURING FLAP RETRACTION RED UNLOCK LIGHT ILLUM. A LOUD THUMPING SOUND FROM THE NOSE GEAR. HYD PRESS LT AND STAB MISCOMPARE LIGHT ILLUM. RE-EXTENDED GEAR NORMALLY AND HYD PRESS, STAB MISCOMPARE. REMOVED AND REPLACED LANDING GEAR HYD VALVE, NOSE GEAR UP-LOCK SWITCH AND RT MLG UP-LOCK SWITCH OPS CHECK GOOD. WORK PERFORMED IAW CHAPTER 32-30-02 AND 32-30-05 OF THE MM. REPLACED SWITCH-NOSE GEAR UP AND LOCKED, S84, PN 65-430087, 2 EACH.