Hej,
I found a hint to a workaround in some HP thread (http://tinyurl.com/c732s6f):
I assume that your 3055 just stopped scanning after the upgrade to mountain lion and asu of HP dirvers. So ceteris paribus all you have to do is copy the file://localhost/Library/Preferences/com.hp.LaserJetAIO.plist to file://localhost/Users/Username/Library/Preferences/com.hp.LaserJetAIO.plist
It is mandatory that you DO NOT delete or uninstall any of your old drivers or HP software, since afaik you cannot (re-)install it under mountain lion!!!
If you cannot find the file on your system -> just copy the file from your time machine to both folders mentioned above!
Hope this also works for you, have fun!