Originally Posted by
tubesocksFred
Non serviceable miniature parts pretty much means most maintenance has to be done by the LBS. I haven't regularly worked on bikes in ages, but my last setup, a bike w/super record grouppo were 100% serviceable.
Now with all the WD40 sprayed, much of it got under then handlebar warp, dissolving the adhesive and causing it to get into a tangled mess throughout my ride.
LBS don't do disassembly on Shimano brifters as there are almost no replacement parts available but as mentioned they are generally pretty durable and reliable which makes me think something is defective with yours as they are only 4 months old.
WD-40 can degrade your rubber hoods as well if left on too long.