Those Sights are not serviceable. Must be replaced.
Also, that's a heck of a deal on the sig service. You spend nearly that much just in the new sights. See if they'll install an SRT in it while they have it apart too.
No doubt, that is a helluva deal.
One of my coworkers has a 938 that got scuffed up pretty badly when it fell out of his holster. Dinged the anodizing badly and gouged the slide.
He sent it to SIG and they completely refinished and refurbished it for just south of $200.00.
The most important thing to be learned from those who demand "Equality For All" is that all are not equal...
Gun Control - seeking a Hardware solution for a Software problem...