What was found
TRACK ROLLER SLAT 1-2 900 LT - COMPLY WITH TASK CARD 27-530-809 LT TRACK ROLLER SEALED, TRACK 1-2, TOP FORWARD - SLAT 1 (C-CHECK) REMOVED AND REPLACED LH SLAT TRACK 1-2 SEALED ROLLER (TOP FORWARD) IAW AMM 27-81-43-400-801-A01. OPS TEST OF THE FLAP AND SLAT SYSTEM COMPLETED IAW AMM 27-50-00-710-801-A02. OPS TESTED BAD. WHEN FLAPS/SLATS RETURNED TO THE FULLY RETRACTED POSITION A FLAP HALF-SPEED INDICATION WAS DISPLAYED ON EICAS.