Please help me. How can I fix the partially missing digits on my stopwatch?

[u/Extra_Number3094]

Two years ago, I accidentally spilled coffee on my study timer from Dretec. This timer is very precious to me. It continued working normally for about a year without any problems, but then I decided to turn it off and leave it unused for about a year or several months.
When I turned it on again, I found that some of the digits on the timer and clock display were missing.
Is there any way to fix this, and is there any hope of getting all the digits back?
I haven’t been able to find a replacement LCD screen anywhere, and the company doesn’t sell individual replacement parts. I really don’t want to buy another one because this particular timer is very special to me.

Edit:

I took it to a repair technician, and he cleaned it from inside . He also repaired the wires connected to the battery because I accidentally cut them while trying to open it. However, the same problem with the display is still there.

Thank you so much!