trying to help someone over the phone. test button is on the board, not near the switch. however, the mpu is on the side, not the back, like a model s plus. is it a model s? but also has a bill validator, which i didnt think a s could support. anyway, it was showing a code 12. they successfully installed a battery, but now presents a 4949 in the winner paid, alternating with _6_6 . i was hoping it would show a 61 and i could talk them thru a reset. its the same mpu that came out of it. any ideas ? in the pic the last 9 in 4949 is missing due to camera refersh rate. thanks