What was found
AUTO THOTTLE DISCONNECTED, INFLIGHT (TWICE), WAS ABLE TO RESTORE. GROUNDED - YES. ACCOMPLISHED AUTOTHROTTLE SYSTEM OPERATIONAL TEST PER B737-9 AMM 22-31-00-710-801, TEST PASSED, NO FAULTS SHOW ON THE CDU, NO STATUS MSG, NO MAINT. SYS OP'S NORMAL.