What was found
THE CREW REPORTED THE MOMENT THE MLG LEFT THE GROUND, A VERY LOUD SQUEEL BEGAN, SWITCHED DISPLAY FAN TO ALT AND THE SQUEEL STOPPED. THE RT RUDDER WAS REQUIRING A LOT OF PRESSURE TO PRESS IT, FEELS VERY HEAVY, IT DOES NOT TRAVEL ALL THE WAY TO THE RT. THE ACFT WAS REMOVED FROM SERVICE. DEFFERED NR 1 DISPLAY COOLING FAN AFTER MEL 21-05, AUTH 060123M-C MAINT PROCEDURES COMPLIANT. COMPILED WITH INTERNAL INSP OF AFT ACCESSORY COMPARTMENT FOUND SMALL PIECE OF BLEED DUCT INSULATION IN AFT RUDDER CABLE PULLEY, REF IPC 27-21-00, FIG 1, SHEET 8 AG ITEM 65. REMOVED INSULATION IAW AMM 05-21-00 C/W OPS CHECK OF RUDDER SYS IAW AMM 27-21-00-710-801, SYS OPS CKS GOOD. THE ACFT WAS RETURNED TO SERVICE.