If everything else is working, you have one more trace to repair. Test for continuity the trace from pin 2 of the IC31 to the nearby thru-hole solder pad junction. I had similar issue and this trace was missed and problem solved. Also check the resistor array as these are also affected sometimes and not easy to see damage.Hope it helps.
Message
Re: Problem with program write
2014-08-17 by raelockard@comcast.net