Residents had petitioned for an audit based on concerns with how some tax dollars were being used.
Some say a motor fuel tax and dedicated sales tax revenues were being put into the general budget improperly instead of being spent specifically for road repairs.
The controversy may have played a part in elections earlier this month.
Two board of trustee members up for reelection were voted out of office.
A final auditor's report will be issued in the next two to three months.