What was found
AUTOTHROTTLE DISCONNECTED 3 TIMES WHILE IN FLIGHT. OCCURED WHILE ON DESCENT AT 1000' PER MINUTE 280 KNOTS. REMOVED FROM SERVICE AND PLACED ON MEL 22-30-00B. RETURNED TO SERVICE. MEL CLEARED 5/15. INTERROGATED CMC, FOUND FAULT 22310020TA2, REF. E175 FIM 22-31-00-810-860-A00 FOR T/S. REPLACED TCQ ASSEMBLY IAW E175 AMM 76-11-01-000/400-801-A. ALL TESTS PASSED. PERFORMED OPS TEST OF AUTOTHROTTLE/TCQ INTERFACE IAW AMM 22-31-00-710-801-A. TEST PASSED. SEE LP 1023987 FOR LLM SIGN OFF. A/C IS CAT III QUALIFIED. STATUS PLACARD READS CAT III. RETURNED TO SERVICE.