Nice troubleshooting. I had a feeling it was the faulty head causing it.
BTW, the self test runs regardless of whether you have the first warm-up disabled or not. The first warm-up just puts it in parking mode for 60 seconds so you can show a cop "hey it's parking sensors" by turning it on and letting them shoot/try it.
If you have the parking sensors/beeps enabled this is also a good way to test out heads,by seeing if they respond to obstacles as they should
But you're right, it would be nice if the ALP told you which head (on which port) was causing the error.
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