I've only replaced the dampers on my P3P 3 times in 3 years. The first time was due to noticeable jello creeping into my videos. I think this was because the gimbal guard usually fell off inside my backpack and the front dampers were constantly stretched with it sitting upright.

Anyway ... sorry to be so long-winded ... the P4 gimbal and dampers are inside the shell. If we support the gimbal with the guard to reduce stretching of the dampers, how long should they last? Are we supposed to go in and replace them ourselves or is it a warranty thing?

Hi, I would recommend you change the damper if it become solid. The accessory warranty period is 3 months. Here is the link of warranty period for your reference: https://www.dji.com/service/policy?site=brandsite&from=footer

How do you replace them?  Can you link to a vid or a website to show me how?