I'm guessing it will be like my '97 which I've had apart a couple of times.
Spraying stuff in often just leaves the junk in there and clogs things up more.
The switch levers on the outside move small 'button switches' inside. These are kind of sealed but not very well with a rubber push over cap which can fall off. The small switches themselves can't be opened up, but can be dunked in switch cleaner and operated submerged to get cleaner fluid in and out.
Your problem is not switch contacts (yet), but once inside you might as well do the lot and clean the switches. You will probably find that plastic parts of the switch mechanism are rubbing, causing the operating lever to stick. The best thing for that is a very small smear of Teflon grease (sold in cycle shops).
You have to remove all the small screws you can see and then the covers. There are a couple of very small torx self tapping screws to remove which expose the internals. BUT BE WARNED. There are a couple of small fine springs which sit in the mechanism and these can fall out once the switch internals are exposed. The switch wires are tightly packed into some parts which have a plastic channel and they use a small tiewrap to hold them in. If you cut the tiewrap, write down the order of the wire colors as they layed them and put them back the same way. Dismantle over a clean bucket or something. Also it's easy to forget how some of the parts go back, so take photos and have patience.
BE WARNED 2 that if you bust or lose a part you will have to buy a complete new switch ($$s)!
A common problem is to not get the covers (clam shells) fitting correctly when re-assembled. It takes a bit of fiddle to check the gaps are the same all around and the covers aren't rubbing on the switch levers (which might be your problem).
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