Can MFJ PS be "cleaned up"?

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Can MFJ PS be "cleaned up"?

BobConvers
I wsa given an MFJ-1317 PS, rated to supply 2.89A at 13.8VDC.   However, this
is apparently not one of the lucky ones, and it puts out lots of hash.   I
put several ferrite cores on both the input and output lines, with little
improvement - the hash appears to be coming through the case.   Has anyone had any
luck cleaning up one of these?   Also, it's not obvious how to open the case,
and before I use brute force, does anyone have any hints?   TIA,

Bob, WO3E
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