A1466 left shift keyboard issye

Hello guys.
I got a Macbook Air a1466 come in last week that had issues with the left shift key.
i have replaced the keyboard with a brand new one which seem to have fixed the problem, however the next day I have booted the MacBook to have it boot in safe mode and it seems the shift key is continuously on yet it's a new keyboard and was working yesterday.
has anyone else had this issue ?
 
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