wath does al03 mean ?

Lots about al03 here...

http://www.howtomendit.com/answers.php?id=13831

and here...

http://www.almesberger.net/ld87/al03.html

It may be possible to access the pump impeller from the bottom of the sump inside the cabinet - one screw.

Good luck...

Peccavi
March 2013