I love Firefox but I hate their internal PDF viewer. Same with most browsers. There are a number of features of Acrobat that you lose using a browser.
We had a problem with a MP C3503 out at the Hyundai Kia West Coast Proving grounds. They had 4 of them but only one with a problem, the one outside the Engineering office. Our junior tech got the to agree to swap that one another one, including swapping the IP addresses. The problem stayed with the location. The only explanation we could come with was it had to do with an font character that the C3503 could not resolve. It only occurred when there were engineers visiting from South Korea.if the customer uses more printers perhaps you can swap 2 of them among each other to see if the problem sticks with the place or with the printer.
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