Hi all , I've been too the garage today and have had the diagnosis..... these are the codes, p1664 electric heater booster oprn circuit. P1636 electric suction fan open circuit. Both engine codes. And these codes are from the gear box which since the errors were cleared the gear box works fine..... 014 rpm compression n2 to n3 implausable. 110 rpm . 146 inadmisable transmission ratio. 147 gear implusable. Could anyone let me no what thes mean plz
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