What was found
SLAT DISAGREEMENT LIGHT ILLUMINATED UPON SLAT EXTENSION DURING APPROACH INTO MSP ACCOMPANIED WITH A ROLL TO THE LEFT. COMPLIED WITH COM PROCEDURES AND AIRCRAFT LANDED SAFELY WITH SLATS RETRACTED. MAINTENANCE INITIALLY LUBRICATED THE 'T' DUCTS BUT HAVE SINCE ELECTED TO REPLACE BOTH 'T' DUCTS. ALSO, A COMPLETE INSPECTION OF THE SLAT OPERATION SYSTEM AND COMPONENTS HAS BEEN ACCOMPLISHED PER MOTR LOG. DUCT REPLACEMENT LOG HAS BEEN DEFERRED. AIRCRAFT RETURNED TO SERVICE.