5000TQ Door Latch

[Stephen Sherman]

Another of my 87 Audi's cold weather problems has surfaced again with 
this cold snap; the driver's door will not open from the inside whenever 
it is below 10F or so. Works fine from the outside latch, or at warmer 
temps, or after the car has warmed up for a while; so I don't think it 
is the door latch itself per se, but something about the inside latch 
handle/cable.

I had planned on digging into the door next time it warms up, and wanted 
to gain any insights folks here have about what might be causing this. 
It seems that when it's cold/not working, the inside door level just 
doesn't move enough to release the main latch. It moves all the way, as 
far as it does when it's warm and works; that just isn't enough to 
release the door latch. Is there an adjustment for taking up some slack 
in the cable or the like? Maybe bending the inside door release 
lever/mechanism a bit? Anyone solved this annoyance?