What was found
RT MAIN GEAR SHOWED RED ON CONFIG PAGE & GEAR HANDLE WHEN RETRACTED. PERFORMED CHECKLIST. WOULD INDICATE DOWN BUT NOT UP. ALSO WITH SLATS EXT & FOOT 20 WOULD GET AN INTERMITTENT AUTOSLAT EXTEND & STICKSHAKE. WITH FLAP 15 HAD INTERMITTENT SLAT DISAG & STICKSHAKE. DUMPED 3000 LBS FUEL. RETURNED TO SIN. FOUND RT LATCH SPRING WEAK. REMOVED AND REPLACED SAME. ADJ CHECK RT MLG UP & LATCHED PROX SENSOR PER AMM LDG RETRACT TEST 10 TIMES GOOD. ACARS MSG SHOWED LT SLAT POS SENSORS 4A & 4B ABNORMAL WITH SLATS EXTENDED. REMOVED AND REPLACED BOTH PER AMM. TEST SLAT POS INDICATION, & STICK SHAKER TESTS PER AMM. ALL TESTS PASSED. RETURNED TO SERVICE.