What was found
PILOT REPORTED THAT THE AUTOFEATHER CYCLED ABOUT 5 TIMES ON FINAL APPROACH INTO DEN, RPM DROPPED FROM 1700 TO 1400 ON NR 1 ENGINE AND RETURNED TO 1700 AFTER ADDING POWER. MAINTENANCE REPLACED THE LT AFX LOW PRESSURE SITCH AND RIGGED THE RH ENGINE , FCU DEAD BAND PROP LOW PITCH SOLENOID AND BETA VALVE, OPS CK GOOD REF AIM CH 7 61-21-00 AND T.C. 1900-7180-10.