Increased steering effort

This morning I noticed my steering power steering has increased in effort. The power steering is definitely still working as with the engine off key on the steering wheel is almost impossible to turn. I would say it’s about 30% more difficult to steer. especially when parking I notice it. Power steering fluid level is good and pump looks fine. I also hear and very faint whine when turning the steering wheel. I have heard of a solenoid that controls steering assist based on speed with a control unit. Anyone have any idea on where I should be looking or any info on the system I don’t know? Cheers

update: wiring to the pps solenoid ( solenoid on the steering rack) was broken. Repaired the wiring, good as new.