If an internal element has been replaced, say, a focus element, it may not have matched reflecting colours.
The technician should have tried to match colours, but maybe none was available.
It would be quite normal for Swarovski to check the whole binocular and do any work they thought necessary.
This is not underhand, but normal.
If there is no visible difference in use, this is really not a valid reason to complain here.
If you felt angry, you should have complained to Swarovski.
I had to deal with complaints in my business.
Some were valid, many weren't.
With the non valid complaints I just refused them.
However, with binoculars, it seems makers replace or repair just to make the customer happy.
The problem is, each time a binocular is sent in for work, unwanted dust specks might appear or even finger prints.
The customer is always right.
Well, not to me.
More important is the fact that Swarovski rubber armour seems to be poor or faulty.
Luckily, I only have two Swarovski binoculars.
A 10x25 that I cannot use as the eye relief is excessive and it just flops around not holding IPD.
Also an old 10x40 that is just a mess.
I do have good Leica and Zeiss binoculars.
If I want good resolution I use IS binoculars.
It is quite in order not to buy another Swarovski, if someone is angry with Swarovski.
A Zeiss 15x60 was sent into Zeiss head department for moisture on most internal elements, including eyepieces.
The technician knew what he was doing, but chipped an eyepiece element.
He correctly blackened the small edge chip.
This has nil effect on the view.
The cost to me was nothing.
Horace Dall's 8 inch Maksutov Cassegrain had an oversized primary that was not round it was hand produced to approximately round.
This Maksutov was likely one of the best ever made.
I get angry sometimes, but not about optics.
Regards,
B.