What was found
ANTI-SKID LIGHT ILLUMINATED AFTER LIFT-OFF AND FLICKERED THROUGHOUT REMAINDER OF FLIGHT. ACFT GROUNDED. AIR TURNBACK - PERFORMED AACU BITE B737-800 FIM 32-42 TASK 801. FOUND FAULT LOGGED "VLV 4". PERFORMED BITE AGAIN AFTER CLEARING FAULT. FOUND BOX 1-4 LOGGED. ACCOMPLISHED FIM 32-42 TASK 803. FOUND VALVE 4 OUT OF LIMITS. REMOVED AND REPLACED THE RT OUTBOARD ANTI-SKID VALVE, IAW AMM 32-42-31. LEAK CHECKED GOOD. PERFORMED AACU BITE FIM 32-42 TASK 801. NO FAULTS LOGGED. SYSTEM CHECKED NORMAL.