In the MX newspaper yesterday (24/11/2006), PTUA Vice-president Alex Makin was paraphrased as saying that the Hitachi trains should be replaced immediately.
This appears to have been a misunderstanding with the reporter. The PTUA has a long-held view that the Hitachi trains should not be scrapped. Rather, they should be upgraded with intercoms and security cameras and kept in service to help relieve overcrowding by providing extra services. At this point in time, expanding the train fleet is more important than replacing old (but serviceable) trains.