What was found
DURING DESCENT WITH ENGINE & WING ANTI - ICE ON INITIALLY RECEIVED A NR 3 MANIFOLD FAILURE LIGHT SELECTED. WING ANTI - ICE OFF, NR 3 MANIFOLD FAIL LIGHT REMAINED ON, BUT NO LEVEL3, AIR MANIFOLD 3 FAIL ALERT , SYNOPTIC SHOWED RED FAILURE INDICATION OF MANIFOLD 3. AS WE LEVELED OFF & POWER CAME UP THE LEVEL 3, AIR MANIFOLD 3 FAIL ALERT, CAME ON FOR APPROX 3- 5 SECONDS THEN WENT OFF. THE RED, MANIFOLD FAIL LIGHT, OVERHEAD PANEL STAYED ON FOR NEXT 10 MINUTES THEN WENT OUT WHEN THE PACK TEMP & BLEED AIR 3 TEMP DECREASED. HIGHEST PACK TEMP NOTED WAS 170 F. SYSTEM TESTED GOOD IN REFERENCE TO AMM: 36-10-02-5-0. RAN NR 3 ENGINE IN REFERENCE TO JRH. NO FAULTS FOUND.