A HD service manual is in your future
and it is a wise investment.
If your primary has just been worked on the answer is NO you shouldn't need to change the primary fluid, The HD maintenance schedule is every 10,000 miles on the primary.
No you do not have to take off the primary cover. You do have to remove the derby cover (you can reuse the old gasket) on the primary on the 2007 and later touring models, that is where you will fill the primary with the new fluid.
There is a drain plug under the primary just to the rear of the kickstand.
Make sure the bike is in an upright position when filling the primary and you only need to put in 38 fl oz (1124 ml) of fluid.
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08 FLTR candy red sunglo,with 2015 103 HO, V&H Dresser Duals with Monster Rounds, Power Vision tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.