Congrats on the new job
I've had some bakelite than was very faded from the sun, but not white. Have you tried any solvents to clean it ? Bakelite is very chemical resistant so you can use paint or lacquer thinner in it without any worries.
The TS-18 A is virtually identical to the TS-18. A few tubes filaments are wired a little differently is all. I found a 10 uF in one of mine that someone added. It didn't make any sense where it was so I removed it and the set works fine
Here's
a reference picture of the of the one in my 9T1. It's 100% original as near as I can tell.