Good morning all just thought I would share an update.
I had it booked in with Sytner 8th Dec - they phoned up said they could actually replicate the fault and replaced the whole amplifier.
Labour cost: £138.00
Amplifier cost: £1,129.98
VAT: £253.60
Total: £1,521.58
All completed under warranty of course - and all problems now sorted!
Very pleased with Sytner Leicester