I was on my way back from a road trip and noticed my boost would not go above 6psi. I also noticed the trans shifting very softly.
I cleaned the banjo bolt and was following the lines when I saw this......problem fixed!

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'85 300SD (formerly california emissions)
'08 Chevy Tahoe
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'88 Kawasaki KDX200
'71 Hodaka Ace 100
'72 Triumph T100R