Removing D28 kills AM transmission... on mine it did...
What the heck you up against?
Can you post up a pic of where your D28 is?
There are several board "types" but if you have this one...
Here's what I would do...
Locate rear panel in Yellow Square,
Locate Q54 - to it's right - next to it are a SMD cap and Resistor
Place BANDED end of Diode to Starred location
(towards rear panel)
Use a 220ohm resistor in series
-solder it's free end to opposite side of these two parts
To compromise the Limiter to function less clipping - SHORT out D28 using solder blob or remove and solder jumper in place.
AM ANL W10 pot can now control Limiter linearly...
To disable Limiter remove D41 - Not shown TP501
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