The United States Department of Agriculture which oversee and enforces PACA provides a form where disputes outside of the court system can be address:
Informal Complaint – A company with a PACA dispute can file at an informal reparation complaint with any PACA Branch regional office. The complaint must be in writing, accompanied with a check for $100 (filing fee).
Mediation – No attorney is required for this process.
Formal Complaint – If informal methods fail, a formal complaint can be filed resulting in a order issued by the USDA for payment. The USDA requires that the documents accompanying the formal complaint be notarized, submitted in triplicates along with a $500 handling fee.
Those are your methods of resolving PACA disputes outside the court system.