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Z9+ Service menu code please!

HP Recommended
Designjet Z9+
macOS 10.14 Mojave

Hey guys! I'm facing problems loading paper, printer always says that there is paper on sheet path, so I assume the sensor has some problem. I've tried cleaning it up with no success, now I need to enter service mode to calibrate it but had no luck with 3174 code. Could you provide please the service menu code for the Z9+ printer? Thanks in advance, sorry for my english. 

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