Traditionally a suppliers warranty is limited to the item itself.....there might be scope in the CPA to push this boundary, I don't know.
Your mark-up on the item when you sell it to the customer would usually cover the inconvenience and replacement labour should it be necessary under warranty. Obviously it's a numbers game, the hundreds you install and don't get a warranty claim for would go some way toward funding the one that does need replacing as well.
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