F&P black marks on clothes ?

Hello,
Along with the Fisher & Paykel ecoSmart GWL11 washer, we also have the front load F&P dryer. I don’t remember the model but it is the one that is basically a Maytag (or other maker) that has the customized F&P control panel. Ever since I got these two (3 or 4 years ago) every once in a while I will find small black streaks (about an inch long) on white clothing such as under shirts or sheets. I have always attributed this to the dryer, but I have never been able to find the cause. (In the troubleshooting section of the washers owner’s manual it mentions scrud, but I don’t think this is the problem as we regularly wash in a hot cycle and never use fabric softeners. No mention of this in the dryer manual). Last night we washed a white felt blanket that came out with really bad greasy type streaks that were very large and some were at least 6 inches long. We spot treated them and rewashed it to get most of it out. (In this same load was another white cotton blanket and other assorted pieces, nothing was overly soiled or greasy and nothing else came out with these streaks) So this time I know it happened in the wash, although there may still be something going on with the dryer too so please chime in if the little streaks are familiar. Is there any parts that would fail that would allow grease or oil into the wash? It is working fine and we have done a few loads since with no troubles.
Are others experiencing at least the same little streaks that I have always had? Perhaps a fix is out there?

Would someone be willing to email me a service manual for a Fisher & Paykel GWL11 to levin dot davie at gmail dot com

Thanks much!