The Fund will have 15 calendar days after receipt of an invoice by the designated payment office to notify the contractor of:

The existence of such defects or improprieties will delay the commencement of the time period specified in section 1003.4 of this Part until such defects or improprieties are corrected. When the fund fails to notify a contractor of such defects or suspected improprieties within 15 calendar days of receiving the invoice, the number of days allowed for payment of the corrected proper invoice will be reduced by the number of days between the 15th day after receipt of the original invoice and the day that notification was transmitted to the contractor. If the Fund fails to provide reasonable grounds for its contention that a defect or impropriety exists, the date by which the contract payment must be made in order for the Fund not to become liable for interest payments will be calculated from the date of receipt of a proper invoice.