Welcome to WebmasterWorld Guest from 18.104.22.168
As you know, you will not be able to access your account during this maintenance, but your ad serving and reporting will not be affected.
Since the maintenance CTR -19.64% therefore eCPM -18.26% compared to May 1st to June 7th.
Yeah, there's nothing wrong is there AdSense?
I never see them posting about reduced earnings!