Do I need to remove my FU

[brc51m]

Unfortunately I am starting to have tranny issues so I am bringing my truck to a Cottman transmission to have the fluid changed in hopes that it fixes my prob. After driving the truck for a while I am assuming the tranny is haeting up and it doesnt want to shift out of first gear and the OD off lights starts to blink but if I shut the truck down for a while and restart the lights does not flash and the tranny shifts just fine. My question is do I need to remove my FU before Cottman hooks their computer up to my truck or will my tunes be fine????