What was found
DURNING CRUISE AFTER TURNING OFF WING ICE THE RED MANF LIGHT ILLUMINATED ON #3 WITH ASSOCIATED "MAN 3 FAIL" LEVEL 1 ALERT. FOUND PRESSURE SWITCH FAULT BALL DROPPED IN WINDOW ON PNEUMATIC MANIFOLD FAULT INDICATOR. RESET FAULT BALL. SUPPLIED PNEUMATIC AIR USING APU, PRESSURIZED ALL 3 SYS, RAN ALL 3 PACKS, FOUND NO FAULTS. PERFORMED TEST OF WING ANTI ICE SYSTEM. OPS CHECK GOOD, NO FAULTS OR FAILURES. 30-11-00-5. PER TSI PERFORMED DECAY CHECK OF #3 SYS. DECAY WAS 8.1 SECONDS. REF AMM 36-00-01-5-0. R & R #3 MANIFOLD FAILURE DETECTION PRESSURE SWITCH PER AMM 36-23-03-4, ACCOMPLISHED ADJUSTMENT AND TEST OF MANIFOLD FAILURE DETECTION PRESSURE SWITCH PER AMM 36-23-03-5 STEP B. ALLTESTS NORMAL , A/C OK FOR SRERVICE.