This MIGHT simply be some dirt (or a spilled liquid) in that area that can be cleaned out IF you know how to work inside a keyboard, and IF you know how to open AND re-close it without damage. Some keyboards use individual key switches which are pretty much sealed units and can only be replaced individually with the correct part. But other types use a single flexible sheet of plastic that carries small black buttons of carbon on its bottom surface to match the locations of metal contacts on the underlying printed circuit board. Each key merely presses that button down to short out the two contacts below it. With THAT kind you can lift off the plastic sheet. Then you can use a clean simple pink pencil eraser to "scrub" all the metal contacts on the board - the eraser is a VERY gentle abrasive. IF there is spilled contamination on the board try to use a tissue dampened with water or alcohol to wipe it off, then be SURE it is DRY before proceeding. Finish that by brushing ALL debris off the board. Now turn over the plastic sheet and very gently push up each carbon button and do a similar gentle "scrub" on each, then brush off debris again. Ensure that all those buttons are pushed back to their normal position. Re-position the sheet over the circuit board and re-assemble the keyboard.
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