Recently I decided to switch to Electronic Funds Transfer for Google Adsense, since it’s more quick and convenient for me. I have already received some checks and I decided to credit them back to receive funds via Western Union Quick Cash. I’ve followed Google advices, and went to the following link. I have tried filling this form about 10 times, trying different values for Payment Amount (Checks are in USD, but my reporting currency is EUR). Every time the response was the same: We are unable to find your check. There are no guidelines or hints on filling the form; Adsense forums are full of messages reporting errors.

Finally I found the solution, that has successfully stopped my check and funds were credited to account balance. Here it is:

All you need is to use another initial URL for the form. Here is the correct URL: https://www.google.com/adsense/support/bin/request.py?contact_type=request_reissue_received. After I filled this form, I got the message that my check was stopped.

Hope it saves you some time, since I spent some hours trying to find the solution.