The button rows - easy to remember because of 5ths. Major/Minor/7th/Contra

http://www.accordionpage.com/basar.html

To pop the cover, remove six screws with a tiny (eye-glasses type) screwdrive. Most repair is very easy....However, there are many caveats about reed repair.

Repairing your accordian
http://www-2.cs.cmu.edu/afs/cs/user/phoebe/accordion/accordion-repair-yourself.html

Accordian World Wide
http://www.accordions.com/

A Warning About Reed Repair
http://home.att.net/~n4dee/fixit.htm

A mountain of accordian Links

http://www.accordionlinks.com/educational.cfm

HAVE FUN!!

Sincerely,
Gargoyle