What was found
BWI - FLT 3530 - ON CLIMB AFTER DEPARTING, EXPERIENCED AN UNCOMMANDED AUTOFEATHER OF THE NR 2 PROPELLER. ENGINE WAS SECURED AND AIRCRAFT RETURNED TO BWI WITHOUT INCIDENT. C/W UNSCHEDULED FEATHERING CHECKS AS OUTLINED IN PRATT & WHITNEY MM. REMOVED AND REPLACED COMPLETE PROPELLER ASSY IAW MM. ALSO, REMOVED AND REPLACED ENGINE SPIDER HARNESS IAW MM. GROUND RAN AIRCRAFT. OPS CHECK NORMAL. AIRCRAFT RETURNED TO SERVICE. REFERENCE: OPERATOR CONTROL NR 96ZZZX3850. AIRCRAFT TOTAL CYCLES: 13,253. (X)