Hey so sorry for the repetitive on this. I was looking thru the archives of the TSB's on this. could not find??

I own 2010 f150 platinum. I got the transmission re flashed shifts great when accelerating. but when I am coasting it goes down to 1 rpm them at about 35mph it goes to 1.5rpm kind of like a bump then back down. now I know the 2009 has a TSB on this. my truck was built in 7-10. does anyone know if there is a TSB on this??

I had to take this in due to the passenger speaker stopped working.. they are replacing it but not with a fight it felt like. too much rocking Neil Young suspect but I don’t play it that loud.