The only difference is the track switching, so the EL3515 version, which is in fact rarer, will do just as well. If you do need the EL3541 version, it's available here....
http://www.service-data.com/product....40/6073/e14540
There are a few weaknesses on this machine and you have found one out already I see. You can get a kit from Ebay with all the relevant bits on it, and a full manual of what to do to bring this machine up to spec. It may seem expensive. but it's well worth it.
http://www.ebay.co.uk/itm/Philips-EL...item19dde84452
Note that I have no connection with the seller and this is purely provided as information.
Check that the Erase Head is not broken at the base. It does happen sometimes.
Cheres,
Steve P.