c5 corvette battery drain

Every 2 days the battery drains on my 2000 vette when i take the key out of the ignition and exit the car the radio still stays on face of the radio has to be removed every time i leave the vehicle. Even after removing the face off the radio the batt still goes dead i took it to the dealership and they fixed the problem in 25 minutes for a cost of 200 dollars the problem started again 3 months later im not trying to go back to the dealership since they cant fix the problem im tired of hooking up a battery charger on the car everytime i get out would the BCM need to be replaced/reprogrammed

Chris Trautman @ Corvette Assembly Plant 2019

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