Thank you. But actually not that knowledgeable, just done a bit of search that was all. Unfortunately, beside the normal promo stuffs, not that much information for both P-Bandai kits around. There were people that built them and display them, but pretty much no one shown the instruction manuals or the part trees like Dalong do in the reviews. So with the information gathered, came to the conclusion that both P-Bandai kit allows you to build the core kits, but instead of all the armaments and stuffs, you get debris field parts and battle damaged parts. The good thing was that for both kits, they do have both normal and battle damaged to allow the builders to non damaged or battle damaged MS.
Good to see the mix up build, not always have to be damaged based on what they included, it can also be very little partial damaged.
Anyway, back to the main thing.
Have not been dealing with water slide decal, dry transfer, or stickers, pretty much since dealing with Gunpla, what will be said will likely sounded stupid. So based on the promo picture and compared,
(Picture borrowed from Gundamkitscollection)
It does not seemed to be that bad, well you have the kit so you should also have picture after decal being applied. Though you might want to take care of of the little air bubble part, borrowed your picture by the way, that the little arrow was pointing,
Since it was water slide decal, maybe you can reapply it to take care of it, or use a needle to poke just a little hole and squeeze the air out. Though maybe you want to wait for someone with more experience to weight in before attempt to take care of the bubble part. As mentioned, total noob on them.
If you were referring to the discoloration on the lower part of the mono eye, then that does take a bit of experience to fix it. You can probably use some paint to take care of that.
Or, sort of completely off the way, you can print or have someone make the decal for you to replace it. Read it in one of the post probably a year or so back, that you can make your own water slide decal. You can probably have scanned the picture per manual, again borrowed your picture, with the little red circle,
Since manual mentioned that you need to make cuts, edit it in some way, then make sure it was to scale and printed it out to make a replacement. Though as typing, that sounded like a lot of work. Not sure if you wish to pursuit that route though.
Edit: So after some searching, found https://thosegundamguys.org/decal-creation-tutorial/ which was also mentioned in the forum threads "What Kit Should I get?" & Recommendations and Creating your own Decal template
There was also the thread Would this work on ....
There was also mentioned of Samuel Decal which can make custom decal…
Sorry cannot be much of help. Would help more on the decal, but have neither kit nor really attempted to get them before…