HP-25 Keyboard fix, dissambely advice ?

[allstonma]

Hi All
I have inhereted my fathers old HP-25 and the battery pack seems to have leaked and effected the keyboard. Got the case apart, but need to remove the board with the buttons from the front cover. Any advice on how to do this ? Does not seem to be an obvious method.
While were at it, seems like the battery door is stuck, and advice on this as well ?
Many Thanks
Allstonma