![Hi guys! Half a year ago I bought a new casio fx-991ex. Recently 3 keys stopped working (optn, calc, left) though the cursor is blinking. I haven't spilled water over it nor Hi guys! Half a year ago I bought a new casio fx-991ex. Recently 3 keys stopped working (optn, calc, left) though the cursor is blinking. I haven't spilled water over it nor](https://external-preview.redd.it/SH6Zb9aQg2VHaPfeF6LT9C10IPC_Fi7y_LtVPbHvFFY.png?format=pjpg&auto=webp&s=52445826fdfe0a805eff7f84a1c84d303e6b4efc)
Hi guys! Half a year ago I bought a new casio fx-991ex. Recently 3 keys stopped working (optn, calc, left) though the cursor is blinking. I haven't spilled water over it nor
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