I figured out the answer, sort of, based on SQL for a different EA query. This SQL lists all the trace relationships in the model.
SELECT t_connector.Connector_Type AS [CLASSTYPE],
t_connector.ea_guid AS [CLASSGUID],
t_object1.Stereotype AS [From_Type],
t_object1.Name AS [From_Name],
t_connector.Stereotype AS Relation,
t_object2.Stereotype AS [To_Type],
t_object2.Name AS [To_Name]
FROM t_object t_object1, t_object t_object2, t_connector
where t_connector.Start_Object_ID = t_object1.Object_Id
and t_connector.End_Object_ID = t_object2.Object_Id
and t_connector.Stereotype='trace'
and t_object1.Stereotype is not null
and t_object2.Stereotype is not null
Union
SELECT t_connector.Connector_Type AS [CLASSTYPE],
t_connector.ea_guid AS [CLASSGUID],
t_object1.Stereotype AS [From_Type],
t_object1.Name AS [From_Name],
t_connector.Stereotype AS Relation,
t_object2.Object_Type AS [To_Type],
t_object2.Name AS [To_Name]
FROM t_object t_object1, t_object t_object2, t_connector
where t_connector.Start_Object_ID = t_object1.Object_Id
and t_connector.End_Object_ID = t_object2.Object_Id
and t_connector.Stereotype='trace'
and t_object1.Stereotype is not null
and t_object2.Stereotype is null
Union
SELECT t_connector.Connector_Type AS [CLASSTYPE],
t_connector.ea_guid AS [CLASSGUID],
t_object1.Object_Type AS [From_Type],
t_object1.Name AS [From_Name],
t_connector.Stereotype AS Relation,
t_object2.Stereotype AS [To_Type],
t_object2.Name AS [To_Name]
FROM t_object t_object1, t_object t_object2, t_connector
where t_connector.Start_Object_ID = t_object1.Object_Id
and t_connector.End_Object_ID = t_object2.Object_Id
and t_connector.Stereotype='trace'
and t_object1.Stereotype is null
and t_object2.Stereotype is not null
Union
SELECT t_connector.Connector_Type AS [CLASSTYPE],
t_connector.ea_guid AS [CLASSGUID],
t_object1.Object_Type AS [From_Type],
t_object1.Name AS [From_Name],
t_connector.Stereotype AS Relation,
t_object2.Object_Type AS [To_Type],
t_object2.Name AS [To_Name]
FROM t_object t_object1, t_object t_object2, t_connector
where t_connector.Start_Object_ID = t_object1.Object_Id
and t_connector.End_Object_ID = t_object2.Object_Id
and t_connector.Stereotype='trace'
and t_object1.Stereotype is null
and t_object2.Stereotype is null