I was given this (older) 35mm a few years ago, but there was no available manual. The only identifying name/info is: "Z-up110 VP" on the front. It has worked very well, until just now when I went to push the power button (on) and the code which flashes in display window is "88" --- now what? The battery is not that old, and I just moments before took the last of the film (recent, I use frequently) and had loaded a new role...it auto-wound as always and now this. I can't even check the manual to see if it is as simple as needing a new battery, can anyone help me with this please? Thank you.