[R-390] Cleaning?

[Tim Shoppa]

> The aluminum was chemically treated to protect the aluminum
> [anodizing/alodyning]

It's just a single data point, but my yellow striper shows zero sign of
anodizing/alodyning on the side panels.  The back plate, internal plates,
and modules all were alodyned/MFP'ed and have a yellow sheen or a dull
yellow coating.

Is there any way to definitively identify the maker of a mainframe,
as opposed to the modules?  Or is it just commonly assumed that the
RF deck usually stays attached to the mainframe?

One of my R-390A's seems to have had the B+ fuses retrofitted.  Does
this narrow down the range of possible makers/contracts?

Tim.