[MRCA] R-105/ARR-15 mod?

[W2HX]

Hi all, I was browsing ebay and came across this ARR-15 and noticed someone ham-mered the front panel with a column of switches down the left side.
https://www.ebay.com/itm/166778324274

then I saw another one just like it, but better done!
https://www.ebay.com/itm/115721014547

I got to wondering, was this a common mod? Anyone know what it is for (maybe switching attenuation in/out?) or was this an official mod or something?

Thanks

73 Eugene W2HX
My Youtube Channel: https://www.youtube.com/@w2hx/videos

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