SOUTH BEND, Ind. (AP) — A Michigan company is suing AM General, alleging the vehicle manufacturer owes more than $3 million for contract work at its Mishawaka plant.

The South Bend Tribune reports that Michigan-based Allied Industrial Group’s original contract called for $17.4 million in improvements at AM General’s commercial plant in Mishawaka. Allied Industrial retooled the plant’s assembly line in 2015 to ready it for production of the Mercedes Benz R-Class and Mobility Ventures MV-1 vehicle.

AIG’s federal lawsuit filed Tuesday in Indiana alleges that AM General still owes $3.3 million. AIG’s attorney says AM General didn’t give an explanation for the unpaid bills.

AM General sold the plant last year to electric vehicle manufacturer SF Motors.

AM General’s attorney says the allegations are baseless.