not cold enough refrig. side

These so called factory trained techs, at least the ones that looked at my fridge don't know jack. I explained my problem, they replaced T-Stat refridge side, onother time they replaced door gasket, still not cold enough, found your website,
got all the answers. Ordered and installed,defrost
heater and T stat assy and adaptive defrost control. Remove shelves freezer side, remove evaporator cover 1/4" nutdriver ,defrost with hair
drier, unsnap elec. connector and relaced part.
The ADC, removed screws mounted on roofside
was able to lower plastic panel enough to unplug
the ADC, it just laid there, removed and replaced.
Don't know which part was bad, but I do know that
they are interconnected, at this point I din't care to defrost manually which I did for the last 7 months.
Thanks for your guidance. USMC Ross