you can find your lost key password in below path
Project.gradle2.14.1askArtifactsaskArtifacts.bin
open the file and search with the part of the password that you remember. You will find it definitely. Else, try searching with this string "signingConfig.storePassword".
Note: I have experienced the same and i am able to find it. In case if you didn't find may be you cleared all the cache and temp files.
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