I have an old Fluke multimeter (8022B) which is still serviceable.
Unfortunately, part of the LCD display has a blackened area, which obscures
the =/- signs. The black area is always visible, even with the instrument
switched of. Is there any way to correct this problem? The cost of
replacing the display would be prohibitive, even if I could source one and I
could probably buy another Fluke from eBay quite cheaply.

Terry D.