The reports of how dealers misinterpret the warranty requirements have been amusing mostly because they haven't happened to me. My first IP replacement was in Mexico where GM doesn't care if you live or die; you have to get the rig back to the US for them to have a discussion with you, so I was spared the stoopid interpretations.
You don't have to replace the LP unless that is something new. I believe the latest version of the warranty is on the Members Area page under Reference. Pretty sure GM stealer has to fill out a sheet & return it to GM covering the facts of the warranty repair & showing they followed correct diagnostics so GM isn't frivolously installing new pumps, so ask to see the dealer's copy of warranty & proceedures B4 authorizing R&R'g a known good LP. I'm AM sure that the correct diagnostic includes ruling out LP failure B4 buying a new IP.
\'95 P30 Motorhome 16,500gvwr, 26,500mi<br />New Ipump @ 25k, boost, EGT, homemade remote FSD cooler