What was found
(CAN) AT 5:45 HRS LOCAL , FLIGHT 044, REJECTED T/O AT 90 KNOTS, DUE TO UNSAFE T/O WARNING HORN RELATED TO SLAT MALFUNCTION. THE PROXIMITY CARD A12 (P/N 805006, S/N 53) WAS REPLACED PER AMM 31-22-02 AND UNSAFE T/O WARNING TEST PARA. CITEM 1,2,3 C/OUT PER AMM 31-22-00. ON PUSH BACK OF A/C, LATER DURING THE DAY AT 15:35 HRS LOCAL, UPON SELECTING FLAPS 4 DEGREES, A RED SLAT LIGHT ON, FLAP POSITION INDICATOR COMES ON (F/E PANEL SLAT MONITIOR PANEL : RT 2 & 3 SLAT LIGHTS DO NOT ILLUMINATE). A/C RETURNED TO GATE AND MTCE REPLACED AND ADJUSTED THE SLAT POSITION PROXIMITY SWITCH SENSOR (P/N 801802) FOR THE SLAT NR 2 & 3 PER AMM 27-82-03.