CD player distortion on all CDs

I've had a problem with a good CD player's drawer sticking all the time. I thumped it a few help. This week got the drawer problem fixed at a local audio repair shop but now when I play ANY CD, there's a great deal of distortion. Once the CD started out fine then in 20 seconds started distorting. Mostly it starts out distorting. I suspect my thumping the top did the dirty trick. What's likely the cause? Laser misalignment? Is it easy for a small-town audio repair guy to fix, or is it likely a new laser assembly is needed? Thanks for your ideas. BTW, I've hooked up 2 other CD players to that audio system and no problem. And the CDs themselves are fine.
I wasn't very gentle with the thumping....and I did it several times out of frustration. I hate to dump it and move on. When I bought it, it was considered one of the best under $1,000 CD players. I posted here in 2003 about the stuck drawer problem (it's been sitting idle since then) but I mentioned the brand name in that post, and commented that the brand had a problem with reliability, so the forum monitor removed my message. That brand has cleaned up it quality problems and is a highly popular brand in the lower price audiophile range now.
Cross your fingers--After the problem with the distortion, I took it out of my system for a week or so, then just on a whim, reinserted it into my audio system. This time, the distortion was gone! After a couple hours of listening, it began to skip some, so I shut it down. After a few days, started listening again and so far no problems. I've listened for at least 10 hours with as many of 10 different CDs. So far so good. So I have my fingers crossed that the bugs have worked themselves out of the CD player. It certainly sounds good and I can see why it was called one of the best under $1K CD players back about 10 or 12 years ago.
They get a hell of lot of thumps in transit before you see it . I received a piece of equipment through FED EX and the 3/16 thick heat sink was bent almost flat. Now thats a thump.
I thumped my Mac Book out of frustration a few times. I now have a Mac Air.