>> However, the two above faults (Relating to DPF Soot/Ash contamination) simply will not clear <<
May be the only way to clear codes relating to 'ash' would be to 'tell' the system that it has a new DPF. Ash is not removed by but the result of regeneration so Ash limit reached would be end of DPF life, in theory any way.
Looks like you have an underlying fault to find next.
Was it a genuine DPF ? what sort of driving is it used for ?
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