packagekit log, line 95 shows "Deleted key 20F8C4F40D210A40", which is the KDE:Extra repo key
var-log-pk_backend_zypp.txt (text/plain), 77.45 KB, created by Maximilian Trummer on 2017-04-27 19:37:55 UTC
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Creator: Maximilian Trummer
Created: 2017-04-27 19:37:55 UTC
Size: 77.45 KB
Actions: View
Attachments on bug 1036659: 723027