Problem with my 11c

[hayesbd]

Hi, folks! New member, here...

I have an 11c that has been my trusted companion since college (1985) and a few months ago, the millionth drop caused a broken lcd. I just replaced it with an lcd from a vintage 12c since that was less expensive than sourcing a complete 11c. When I had it apart, I noticed that the ON key was not working correctly, even before the screen replacement (there was enough of the screen still visible).
To make a long story short, I got the lcd replaced just fine, but the problem with the ON key still persists.
Essentially, the calculator works, but cannot be turned on with the ON key. It will turn it off, though. Most any other key will actually turn the calculator on, but will display random results. I can clear the display and it seems to then work normally. With the ON key not working, the self tests do not work.
I shorted the battery contacts with the batteries in place and that allows the ON key to power up the calculator (once) and displays Pr Error. Again, clearing the display allows it to work apparently normally.
I am willing to live with it this way, but before I button it back up completely, I wondered if there is anything left to try.

Many thanks for any help you can provide.

Regards,
Brian