As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) A/C ABORTED TAKE OFF AND RETURNED TO THE GATE DUE TO UNSAFE TAKE OFF WARNING RT SLAT NR 3 GREEN LIGHT 'OFF', ON THE FLIGHT ENGINEER PANEL AND LEADING EDGE SLAT GREEN LIGHT 'ON'. MTCE REPLACED THE SLAT POSITION PROXIMITY SWITCH SENSOR FOR THE RT SLAT NR 2 & 3 I.A.W. AMM 27-82-03. A TEST FLIGHT WAS CARRIED OUT SATISFACTORY.