[TenTec] Ten-Tec Model 249 vs. Model 249/MK Noise Blanker

[Carl Morris, WN3DUG]

Does anyone know what the difference is between
the Ten-Tec Digital Triton IV Model 544 Noise
Blankers Model 249 and Model 249/MK?

The Model 249 Instruction Sheet says there is a
Modification Kit required to install the 249 in a
Triton IV, with Serial No. below S.N. 1350.  My
Digital Triton IV, Model 544, is S.N. 1130.

The Model 249/MK is used for S.N. below 1350.

Does anyone have any information on what is
involved to make a 249 into a 249/MK N.B.?
The pictures look identical in the manual.

Any help would be appreciated!

72/73, Carl, WN3DUG
cwmorris at pa.net

(In snowy PA...)