follow up .
ITs actually not as hard as it looks at first glance.
remove the cables ,
remove the shifter from the bars
cable tie it open.
There are 2 silver screws on the outside – about 7mm long – remove them
There are 2 black ones in the middle – about 5mm long – remove them
there is 1 silver screw at the top deep in that holds the top cap in place.
theres a 4mm hex key bolt in the middle that holds the brake lever on – undo that.
and it will come apart – pay attention take photos….
What i found was causing my issue was theres a little spring loaded pawl on the back of the shifter lever – mines was stuck in the open position rusty etc
Got it free’d off and lubed up put in a good chunk of grease – put it back together in reverse and it works like new