P2463 on a '08, 2ltr, Mazda 6 with EML following high revs trying to clear DPF.

Question

Given the EML is also on, should I persist in trying to clear the DPF using a DPF cleaning fluid and a forced regen or do you think its probably a cracked pipe giving a false reading.
I've got it booked into the the local dealership for a proper ECU reading that might provide more detail, but don't fancy the extortionate prices they charge.