I know this is an old thread but I have been looking for this manual for a while, I found this Link, hope it helps anyone else looking for the WFF 1401 manual.
http://www.datasheet4u.com/html/W/F/F/WFF1201_BOSCH.pdf.html
Simon, March 2007
I have one as a .pdf I can email to you - mail your address to bargepower [at] gmail.com - swap the [at] for @!