Before I acquired my Pentax K10D I used to hang out on the Minolta MF Yahoo Groups. There were people there that swore by Garry's and others that swore at them for botched repairs. There are people that swear the KEH does a great job but there was one PF member that said they totally trashed his 645/6X7 film camera (pour oil or something in it).
The point being that your mileage may very with any repair shop or even repair.
Nice to have alternatives.
You could try Picture Perfect here in Southern California. At one time they were an authorized Pentax repair center. They may still be, but I haven't been able to determine that. They don't list anything older than the K1000 but it never hurts to ask. They repaired my brother's LX back when they were officially Pentax repair. He had good things to say about their service.
Picture Perfect Unlimited - camera repair and sales of Pentax cameras
They claim this on the website: "Picture Perfect Unlimited is an Authorized Service Center offering warranty repair service on Pentax & Ricoh equipment and out-of-warranty service on most makes and models." but the site doesn't look to have been updated since 2009 (copyright).