^ with Stephen - I got a ZF Reservoir for $25 IIRC - replaced it last year with stainless worm clamps, snipped 1/4-1/2" off the ends of the reservoir hoses to have a "fresh end" and reinstalled with fresh fluid and did a drain/refill with turkey baster twice - fluid is nice and red and I feel better knowing the filter is fresh - Easy DIY

Any other problems besides that would need shop diagnosis with pressure tester IMO

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2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards