martinibuster - 2:31 pm on Oct 22, 2012 (gmt 0)
...they just reply that no manual action is present.
There are some situations where the ranking factors are reset, for example, because the keywords have been redefined as belonging to a non-commercial meaning (you would be surprised at what is claffied as such) or because certain ranking signals are counting less. In those cases it is not a penalty but rather your site is ranking where Google thinks your site belongs- it is not a penalty. It's very important to be able to diagnose this issue.