Plesk Migration Problems

We are looking for a Plesk migration expert. We are transferring a lot of acounts and domains from several servers. We have had some success with many of them, but now we are stucked with 2 servers. Inside Plesk, it will just show: Failed with no error log at all... We cleaned some domains that were no deletable by Plesk, which was one of the issue, but now, we do not know what to look for or where to go... If you think you can find what stucked us, you will be glad to hear from you.