Non-Functioning Shift Control Option keys on replaced keyboard
Water damaged 2012 MacBook Air 13". Keyboard was replaced. Everything runs perfectly fine except the (left side) Shift Control and Option keys don't work.
Things I've tried so far:
- Updated all preferences and upgraded to OS X High Sierra
- Reset the NVRAM
- Reset SMC using "unplug battery/hold power button" method (can't use "Shift/Control/Option/Power button" method, obviously)
- Ran Disk Permissions
- Ran Apple Hardware test (no issues found)
- Booted up in Safe Mode
- Double-checked that Mouse Keys, Sticky Keys and Slow Keys were not enabled under Accessibility
This seems to be an issue without a solution over many years. Reaching out to see if anyone found a solution short of board level repair. Thanks in advance for any responses.