It's entirely possible that on occasion a WP gets replaced when the cause of the leak is the external orings. If you don't mind doing the job twice on most occasions I suppose you could try that first. I've replaced quite a few 1500 WP's and it's not unusual that there's no obvious fault (the squeak seems wrong though).
If you replace alot of seals on motorcycles...fork...engine...you'll make the observation that in many cases there's nothing visible wrong with the leaking seal.
If you replace alot of seals on motorcycles...fork...engine...you'll make the observation that in many cases there's nothing visible wrong with the leaking seal.