Like Energy, I'd guess that the auditor noticed some high findings areas that weren't audited more frequently. That's usually what the auditor will look for. Schedule all areas at least once each year. Using historical data (prior years audits, CAR's, complaint records, etc.), schedule problem areas more frequently. If you have an area that turns up being a problem during the year, schedule a second audit (possibly as verification for action taken).
Finally, make sure you take credit for those "mini audits" you very likely do. Most Management Reps will do a quick check of the areas that they know have been problems. If you do, take credit for it. After all, it is an audit.