I am not exactly sure what you are asking. The connectors which were connecting the battery pack were having signs of Discoloration in form of rust. But that issue was solved.
I think you need to pau someone to help with this tasks. It appears you need more time to come to grasps with the tasks at hand.
I mistyped that first sentence. I was asking if there was any discoloration ON the steel baseplate. A large area of discoloration is an inication that a module is leaking electrolyte. That creates problems for the battery, but will typically not affect voltage or current.
For that I have to open all the cells and take them out, isn't it? If it is I will have to do that to see discoloration.
I mean, it appears this tasks is above your skill set. Y not get someone paid to do the job? You must not "forcefully" be a Diyer.