There are 2 version of the same keyboard, the easiest way to tell which version you have is by looking at the metal tabs,
the EC29 has 4, 2 on top 2 on bottom, the EC28 has 3, 2 on top, and one wider tab on the bottom.
Your keyboard keys should look the same as below.
Was disapointed with the missing key, so happy to find this site and to be able to repair my keyboard. Thank you so much
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