What was found
ON ROTATION , RECEIVED "TAT PROBE" EICAS MESSAGE, AUTO-THROTTLES STAY DISCONNECTED, AUTOPILOTS WOULD NOT ENGAGE, MCP VNAV AND LNAV INPUTS WERE LOCKED UP AND FLIGHT DIRECTOR GUIDANCE NOT AVAILABLE. REPLACED K410 TAT PROBE CURRENT SENSING RELAY AS PER STANDARD MAINTENANCE PRACTICES. REPLACED TOTAL AIR TEMPERATURE PROBE AS PER B757 AMM 34-12-02-4. PERFORMED OPERATIONAL CHECK OF TAT PROBE AS PER AMM 30-33-00-5. OPERATIONAL CHECK FOUND OK. REMOVED AND REPLACED RELAY K10264 IAW AMM 20-60-00. TAT PROBE HEAT OPS CHECKED OK.