What was found
ENGINE NR 2 T/R DEPLOYED AT 85 TO 90 KNOTS ON TAKE OFF ROLL. ABORTED TAKEOFF. MAINTENANCE PERFORMED: MEL 24FEB21 09:04 ROA C05503 78-1 THRUST REVERSES C/W MAINT AND FLT CREW PROCEDURES. FDR SHOWS #2 ENGINE TR WAS IN TRANSIT. ELECTRICALLY TESTED BOTH THE UPPER AND THE LOWER T/R TRANSIT SWITCH'S. UPPER TRANSIT SWITCH FAILED ELECTRICAL TEST. R&R'D UPPER TRANSIT SWITCH IN REF TO AMM 78-34-01. OPERATED T/R OPS CK GOOD AT THIS TIME.