Only 76 million years? I guess the age of this animal would make it almost contemporaneous with ‘Sue’ the T-Rex that had red blood cells and spongeform tissues still in her femurs.
No red blood cells have ever been found, period. The "remains" of some red blood cells have been found in some dinosaurs (I have no idea about Sue). Red blood cells don't last any significant time at all. The iron formerly in the hemoglobin does.