I had noticed that the ST4000+ LCD Display had developed a black area in the center and was hard to see the display. The system worked OK though.
I was able to find a new LCD display on Ebay https://www.ebay.com/usr/mtnsail970?_trksid=p2047675.m3561.l2559 for $ 129.00 Plus Sales Tax and Shipping. It arrived with instructions to replace the LCD Display.
I took on the project and it was easy to replace.
Caliberation is not needed since the computer is not being replaced.
The alternative would have been to replace he Unit with a $ 600.00 replacement.

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