well in the case of say a Marin with lifetime warranty on the bearings… if we have to replace the bearings we order new ones, they get fitted but the customer has to pay for the labour in doing so,
then we send the bearings back to ATB/Marin and we get credited on the bearings. Not the work we have done.
We tend not to charge OUR customers depending on length of ownership/other work being done at the same time etc but we would charge someone who had bought a marin elsewhere or we would be out of pocket.
this is in the product warranty.
as i mention, it depends on brand.
what we get sometimes is 2nd owners of a bike like a Marin, going off when we try to charge them £30 to swop out bearings on a bike they bought from ebay although that is a totally different thing and pretty much irrelevant.
grey imports… diff kettle of fish. generally not covered for labour at all and in this one instance i would probably have to agree with SSC's conclusion.