What was found
BZN - NR 1 PEC CAUTION MSG W/ POWERPLANT MSG ON CLIMBOUT ABOVE 10,000FT. NR 1 PROPELLER WENT TO 1050 TO 1060 NP. UNABLE TO GET PROPELLER UNDER 1020 NP. NR 1 ENGINE SHUTDOWN PER EA CHECKLIST. RETURNED TO FIELD AND ACCOMPLISHED A UNEVENTFUL LANDING. FOUND NR 1 PROP HAS A DAMAGED BUS BAR. REMOVED AND REPLACED BROKEN BUS BAR ON NR 1 PROP IAW Q400 AMM TASKS 61-10-06-000-804 AND 61-10-06-400-804. C/S CALIBRATION OF THE TMU IAW AMM TASK 30-61-06-820-801. OPS TEST OF PROP DEICE IS GOOD. C/W POWER ASSURANCE RUN IAW MTC 6710005. ALL ENGINE RUNS GOOD. ALL FAULTS CLEARED AND DID NOT REOCCUR. PERFORMED EMU DOWNLOAD. AIRCRAFT RETURNED TO SERVICE.