Please understand that techs responding to support queries may not be developers themselves. We would not confirm through code or logs if we have seen items such as that, as they may well be unrelated in nature. When there are known problems in areas however, we would see them in our bug reports.
The IPS Diagnostics are for general patterns, rather than specific instances. For example, if we see x happening repeatedly in y area on z occasions, we may decide as a company that area needs to be looked into at a higher level than simply fixing one bug.
I understand your are a developer yourself, and I understand the frustration entirely. However we simply cant go through peoples individual code. You are running custom code in that area, and also not running the latest release. I understand you have checked code differences between 4.7.0 and 4.7.1, but we dont support altered code as per our support terms, and while we of course will make common sense exceptions for this (and Im sure you will agree we have in your case on many occasions), there was no information given there. Just that its broken. And we need to follow the support procedure on this.