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Faulty Power Conversion System and Body Control Module

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2 Questions - Own a 2013 Model S P85 which recently doesn't charge with my mobile charger. Displays Error "Charging Slowed - Poor grid power quality ". I've reset the mobile unit and the car and tried a different charger. Charges fine at the supercharging station. Suspect it's the PCS unit. If so, am i able to replace it with a gen2 or gen3 unit as they are more readily available?

Secondly, My key fob isn't recognized anymore despite changing batteries and resetting vehicle. Suspect the BCM. Is the replacement a DIY possibility if the new unit comes with it's own linked key fobs or do I need the assistance of the Tesla Service Center for programming to the car? Thank you