“Sony Computer Entertainment Europe (SCEE) is providing new AC Adaptors free of charge to replace certain AC Adaptors that are supplied with the new black slimline [PlayStation 2]. To verify if you own an affected AC Adaptor you will need your [PlayStation 2] model number (located on the back of your console), your AC Adaptor code and AC Adaptor manufacturing date code (both located on your AC Adaptor).”
ps2ac.com via ITviikko via Juha
The instructions are available in many other European languages besides English (including Finnish).