I've got a SL70CRC.. relly love it.. installed it about 6 to 7 years ago..
Odd thing, I would hang my hand on the upper rim and hit the buttons with my thumb.. doing this, I would rest my thumb on the upper area of the screen..
After a couple years, I noticed the reflective coating from where My thumb rested was comming off, (must have been from the oils in my hand)
Anyway, I called RayMarine
and was told I could have the screen replaced for 300 dollars .. I then asked if I could have it all checked out and gone through to make sure it was opperating right.. she said, sure for 300 dollars.. as I asked about more survice, she continued to say 300 dollars.....
So I finally said, we're up to about 1200 dollars now so I think I'll just buy a new unit.. She laughed and said I misunderstood her, as Raymarine
will completely rebuild
or referbish the SL70 for a Max of 300 dollars...... They did so.. got it back in about 3 weeks at a cost of 300 dollars.. give them a call.......