Noticed groove marks on the brake rotors (drive side front and rear). Car has less than 6000 miles and with recent regen updates, brakes are rarely applied - as shown in the picture brakes discs has developed surfaced rust. After visually checking the pads, both front and rear seem to have enough meat and also checked if there was anything stuck between the pads and rotors for unusual grooves or anything with repeated contact. This is unusual and would not be an issue with both... Assuming this would be due to a faulty rotor/pads?