Check that you haven't screwed in a screw that is to long in the bottom of your thinkpad if so you may have ******** up your motherboard
Get a can of air from your local electronics store. with the laptop powered off thoroughly clean the keyboard. Give full bursts of air cleaning left to right then let it sit while the can warms back up and pressurizes then clean right to left. Do this until you are satisfied that there is nothing more to clean.
After this your error code should go away. If it does not then you may have a malfunctioning keyboard and it will need to be replaced.
Sounds like one of two things...
1. Somebody spilled somthing or got some sticky junk in there and one of the keys is semi gummy.
2. The machine got banged around once too many times and one of the connections is slightly ajar.
So basically it sounds like it's hardware and not software, so you'll probably have to pull it apart yourself, or else take it to someone
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