As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOTH NR 1 AND 2 ENGINES BLEED AIR CAUTION HOT LIGHT CYCLING ON & OFF DURING FLIGHT. ACFT WAS DEICED HEAVILY BEFORE FLIGHT. FOUND P3 LINE TO BLEED SWITCH DISCONNECTED. REINSTALLED AND R & R LT AND RT BLEED HIGH PRESSURE SWITCHES. OPS CHECKED GOOD ON RUN.