I was wondering that, only thing I can think is 4 Inept Twats and 2 visits to a shit main stealer, I'd have EBaye'd it long long time ago, well actually I wouldn't, I'd have fixed it !!
There's a challenge TG, transporter it up here, and if I can't fix it I'll pay the transporter back !!
I've never been beaten yet, a couple have needed 2 goes before they got sent back fixed, and one actually was here 3 months, (in between other jobs), and needed 3 goes to get it 100%, but in fairness to me it did have 3 faulty parts all giving the same "Offset Airflow Drift" Code