SM74 impression cylinder after perfector

Dear sir
When the machine in straight: the impression valves of the PU1 and PU2 work good.
but when in perfector mode
the impression throw in valve of the PU2 unit still engaged even if the papers get out the machine, till I stop the machine.
Kindly Advice
Best Regards

 

Good day Sir
Hope you are well.
Please take note of this: 1) Test the switchs 1 S35+36 +1S19+1B18+2S60+2S31+2S62+2S38
2) This switchs send the signal to the respective Board EAK and others
3) Test the Valve 15K64+NY15+NY14 Thist control the supply unit of sheet turning device .
4) Test the switch-valve hydraulic nB41+NB33+NB34+NB40(Oil level Hydraulic see if there are enought oil, and try to see if there are clean and free of dust or debris in the system. Any dust or debris will have problem.
5) Lock for loose connector or leak problem in the system. in The electrical swtich look for continuity and clean contacts very well, look for loose wires, and oil in the contacts.etc