2009 Range Rover L322 radio no sound fix

My radio suddenly stopped playing and it turned out to be a failure of both the Harmon Karden Logic 7 amp as well as the Bluetooth module. Initially I tested the Bluetooth module because that’s a common failure but the radio still didn’t play. I took the vehicle to a car audio shop and they confirmed the amp was bad. I found an identical unit on EBay for $200 and after replacing it I still had no sound. But when I bypassed the Bluetooth module voila! I heard the radio. After a one day delivery by amazon for a MOST optical bypass $10 my radio is fixed. I use a Bluetooth to aux input adapter to play music from my phone so I don’t use the oem Bluetooth phone anyway.