I'm a beginner bike mechanic. I commute around on an old Raleigh Super Record. I noticed the crank bearings didn't feel good, and I have never opened them. (For all I know they've never been opened.) So today I opened up the bottom bracket to re-grease the bearings. Of course I had to use the Sheldon method to get the fixed cup off, but it looks like a loose bearing got caught up in it, and now there's a divot in my fixed cup.

What should I do? Can I buy a new fixed cup? Replace the whole assembly with a sealed bearing?

Thanks,
Jim