CHAPTER 29RECORD RETENTION REQUIREMENTS UNDERMOTOR VEHICLE SERVICE TRADE PRACTICES ACT61—29.1(537B, 714)  Retention of written estimates and disclosures.  A “supplier,” as defined in Iowa Code section 537B.2(3), or a “repair facility,” as defined in Iowa Code section 537B.4(1)“c,” shall retain copies of all written estimates and estimate disclosure forms for repairs or service to a motor vehicle. Such copies must be retained at the supplier’s or repair facility’s place of business for nine months following the date of repairs or service.This rule is intended to implement Iowa Code section 714.16 and chapter 537B.