A former manager for a Monmouth County auto repair shop is facing charges he stole about $90,000 from his employer by falsifying invoices, authorities said Monday. Joshua Chisenhall, 39, has been indicted on second-degree theft by deception and second-degree computer theft charges. While Chisenhall worked at AAMCO Transmissions & Total Car Care on Route 36 South in Hazlet, he repeatedly stole cash payments received from customers and falsified invoices to make it appear the balance had been paid by credit card between January 2020 and March 2021, authorities said. Chisenhall was charged in Oct…