I'd guess the lithium battery could be replaced. The LCD panel might be more of an iffy proposition. I'm not sure what causes LCDs to bleed--pressure and stress I suppose. I'm not sure if there's any way to avoid that in the normal use of the camera.
It might not hurt to send it for a general CLA to one of the shops that works on T-90s while there are still parts available. You could probably have the lithium battery changed as a preventive measure.