If the problem involves multiple keys that are not entire rows or columns (e.g., a whole column plus some other keys), the problem is often that something spilled on the keyboard. There are many sources on how to try to repair that.
If the problem involves multiple keys that are not entire rows or columns (e.g., a whole column plus some other keys), the problem is often that something spilled on the keyboard. There are many sources on how to try to repair that.