As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA- ON FLIGHT 2372 DURING CRUISE WITH ICE DETECTED TURNED ON BOTH BOOTS AND GOT "DEICE PRESSURE" CAUTION. RAN CHECKLIST. PRESSURE ON BOTH SIDES IS OKAY. NR 1 OUTER BOOT WILL NOT INFLATE AND NR 2 OUTER BOOT WILL NOT DEFLATE. FOUND TWO CUTS ON LEFT HAND OUTBOARD LEADING EDGE DEICE BOOT. REPAIRED IAW DHC-8 Q400 MM 30-11-00. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.