Tell me what the other fault details for that are, please?
SELECT T1.other_fault_details 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
other fault details refers to T1.other_fault_details; fault log entry id is a common field between Fault_Log and Engineer_Visits tables used for joining; ordering by COUNT(*) DESC LIMIT 1 implies selecting the fault details with the highest number of associated engineer visits;