BridgeTroll put up a link to the audit performed by the City Council. I would not consider this in any stretch a full audit.
An independent firm performs an full external audit of the JEA every year. The creditors and regulators require it.
I've heard grumblings on here of hidden accounts, treasure troves, and fantastical investments held by JEA. I'd be real interested in learning what specific things people are looking for with the audit that aren't disclosed in the audit performed by the external firm.