I fully disassembled and serviced the bike over a period of a few months. I installed new Suntour cables/housings. And Dia Compe cables/housings. I found a new in the box saddle on ebay. I paid dearly. The chain is KMC 8 speed.
I got this bike last year and have done some upgrades. Such as 105 derailleurs and calipers. Kool Stop pads, Michelin Power Cup tires and started using the Ultegra pedals that came with the bike recently.