What was found
DURING CLIMBOUT DEICE PRESS CAUTION LIGHT ILLUMINATED. DEICE PRESSURE WAS NORMAL BUT BOOT SET NR 6 REMAINED ILLUMINATED. RETURNED TO FIELD, LANDING UNEVENTFUL. CDS ANTI ICE SHOWED NO FAULTS. NVM FULL, CLEARED NVM. GROUND RAN ACFT VERIFIED DISCREPANCY. C/W TACTILE & VISUAL INSP OF AFFECTED BOOTS. CDS SHOWED LOW PRESS 4A, 5A, 6A FAIL. R & R NR 6 DDV, NO HELP REINSTALLED ORIGINAL VALVE, REF AMM 30-11-16-000-801 & 30-11-16-400-801. R & R TMU IAW AMM 30-11-01-000-801 & 30-11-01-400-801. AIRFRAME DEICE FUNCTION CHECKS GOOD, REF AMM 30-11-00-720-801. NO CDS FAULTS NOTED. RETURNED TO SERVICE.