What is the fault status of that?
SELECT T2.fault_status FROM Fault_Log AS T1 JOIN Engineer_Visits AS T2 ON T1.fault_log_entry_id   =   T2.fault_log_entry_id where T2.fault_log_entry_id  =   ( SELECT T1.fault_log_entry_id FROM Fault_Log AS T1 JOIN Engineer_Visits AS T2 ON T1.fault_log_entry_id   =   T2.fault_log_entry_id GROUP BY T1.fault_log_entry_id ORDER BY count ( * )  DESC LIMIT 1 ) 
fault status refers to T2.fault_status; that refers to the most frequently occurring fault_log_entry_id in the context of engineer visits;