I’ve got an ‘06 t1n with 160k that just came back from a trans service(TC, filter, fluid drain) the shop found a good amount of brass colored “glitter” in the filter and pan. Had moderate RSN which is now gone since service. They said the fluid looked clean(most likely recently changed) Haven’t had any bad symptoms, shifts great. Engages from P to R quickly and no abnormal noises. Should I be worried? Seems like it could be a thrust bearing wearing out?