What's another way to say "problem area"?

Looking for some powerful, formal words with a slight negative connotation for a resume/performance assessment. The general context pertains to computer software development.

These aren't my problem areas, they are areas that were problems in someone else's work that I have identified (thus saving the day).

Here's the actual context:

Regularly conducted memory audits to identify problem areas

deficiencies

failings

shortcomings

weaknesses

flaws

Following your comments, if I get the drift I would propose* chink in armour. Alternatively weak area,weak spot or *blind spot*are perfectly acceptable expressions.

You might consider a qualifier on the term technical debt, such as

Unidentified Technical Debt

This will use a term common to management, "technical debt", while also casting it in one of the most dangerous lights, misidentification.