I THINK I have discovered the problem. It has been a challenge for this non mechanical guy to figure this stuff out.
The other year I had to have an "emergency" water leak repair made. There was water leaking from a line coming from the water filter/diverter assembler/holder. I was just leaving on vacation for a couple weeks and the dealer told me to stop by and they would see what they could do.
What they did was to "by-pass" the water filter/diverter assembly by disconnecting the line coming from the main water supply and capping that off. The leak stopped and since I never used the filter in the first place I never gave it any more thought.
Fast forward to that fall ... I was noticing the problem with not having water come out of the cold side of the tap ... since it was time to winterize I never bothered with it ...
Long story short ... what they did by bypassing that line was to totally bypass the kitchen cold water line that came out the other side of the water filter/diverter holder/assembly. I only discovered that this morning when I was removing the faucet and disconnected the water lines. When I traced the water lines I noted that there was no water line connected to the kitchen cold water line because it had been bypassed.
Since I don't use the filter I have removed it completely for now and will re-connect the cold water kitchen line to the main water supply line and ... fingers crossed ... that should be the problem solved. I hope. :)