The insert has shifted in the holder. I eventually managed to get it centered. Notice the @ symbol someone drew on the 2 key. They also drew quotation marks on the @ key. Here is the board after cleaning. It turned out really nice - It feels buttery smooth. I feel guilty even thinking about using it. The caps look and feel like they've never been used before and the cable is also very good - It hasn't uncoiled or creased.
Lotus 1-2-3 sticker over shortcut key insert Cleaning
I started by pulling all the caps (most of them very stubborn) and then opening the case.
The worst part was underneath the shortcut key holders - it took awhile to get clean. I also took some time to put the insert in the holders properly as they weren't aligned. The shielding is pretty cool - it's made out of some type of flexible plastic as opposed to cardboard which is commonly found in AT101s etc. The board wasn't that dirty - just very dusty. I later noticed that there were only about 2 rust spots, the largest being about 7mm. It has been stored well. Controller PCB markings Spider nest under foot lug. I really shouldn't have opened the switches as every one was in immaculate condition - no dirt, no wear marks. I possibly made the switches worse by opening them and exposing them to the surrounding dirt from the plate... By the time I had all switches done, I'd decided I was ready to clean the caps. I did my usual routine of soaking them in soapy water for a while, rinsing them, wiping them on a towel and then finishing them off with a wet Q-tip. I also cleaned the case. It really wasn't dirty but I wish I could have removed the feet and cleaned them. Speaking of which, I'm missing an O-ring for one foot

Finally putting the caps back on Apologies if any images are dark, I will try to get some better pictures soon!