Any here a PhP genius, who is also versed in ModSecurity?

[kandrathe]

Based on the SQL Character Anomaly Detection Alert - Repetative Non-Word Characters

This is your big clue.

The SQL injection prevention would be looking for special characters, not 0 through 9, A through Z, and a through z. Mostly likely you have a product name or description in the database that has either single or double quotation marks. The easiest types of SQL injection attacks just try to append something simple to a SQL statement e.g. "and 1=1".

Do you have an alternate method of getting to the data stored in the SQL database?