S&W may look at specific repairs on a case by case basis for older guns. But, I wouldn't count on getting any work done for free, especially if you're not the original owner. Smith has good customer service, and they often give folks a break in the interest of maintaining "good will", but they're also in the business of making a profit.
Back in the mid '90's, I picked up a 25-5 from an estate. It was in decent shape, but had holster wear, cylinder wear and a loose lockup. I sent it back with just the admonition to "fix it and make it look nice." They replaced the cylinder, hand, bolt, timed the gun and refinished it. About $235 for repairs and shipping. But, I didn't quibble, it was what I asked for, and the gun looked and operated like new.