Thanks for that info GeorgeWest- although it doesn't sound too encouraging. Less than 6 years - seems sad given the cost. Hopefully Triton responds to the message. Frustrating not to have a phone number to call.
Splintergroup- yep, both sides were about the same (other was a challenge as it was to the back of my setup so had to use my phone as a mirror to see!!)
I have to switch it off to raise to change bits (safety feature) so the switch does get into an on/off sequence regularly.