As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 3845 - RIGHT COWL ANTI-ICE CAUTION MESSAGE CAME ON DURING CLIMB-OUT. RETURNED TO FIELD. FOUND BLEED SOURCE LINE ON THRUST REVERSER PDU DISCONNECTED. RECONNECTED LINE IAW MM 78-32-03. REPLACED RIGHT LOWER COWLING, COWL ANTI-ICE PRESSURE SWITCH, AND COWL ANTI-ICE VALVE IAW MM 30-22-01. OPS CHECK GOOD.