Sorry for taking so long with my update.
I got the new meter open yesterday, it seems to be a little different from the old one.
I got 2.5V on some of the pins that I think go to the LCD.
It looks like it might be possible to solder some wires to the pads in the PCB under the LCD and still get the LCD back on and working.
The micro-controller is ICL7106CM44, I think
http://www.digikey.com/product-detail/en/ICL7106CM44/ICL7106CM44-ND/936120
Any ideas what I should now do?
Remove the LCD and try to solder wires to the pads?
But what if I don't get the LCD back on. How do I compare the input on my arduino to the pH, if I cant see it on a LCD?