What was found
(CAN) MAINTENANCE FOUND #1 ENGINE BLEED BAND ACTUATOR AND THE TRIGGER LINE BLOCKED WITH CARBON. THE BLEED BAND ACTUATOR WOULD NOT CLOSE DURING ENGINE OPERATION. MAINTENANCE CLEANED AND PURGED THE BLEED BAND ACTUATOR PLUS ALL TRIGGER LINES AND CONTROL MECHANISM OF ALL CARBON PARTICLES. ENGINE GROUND RUN SERVICEABLE AND AIRCRAFT RETURNED TO SERVICE.