Just as a caveat, I wanted to mention that I have one dd who has been tested twice on the WISC-IV and I wouldn't necessarily assume that the score breakdown on one day is a permanent picture of the child. My dd, for instance, had a profile that looked very much like your ds' the second time she took the WISC (high VCI and high average or average on everything else), but the first time (one year earlier), her VCI and PRI were nearly identical (both in the upper 130s to 140s). Her PSI and WMI were more average on both testings, though.
I'd be hesistant to diagnose a learning disability based upon one IQ test's scatter. I liked this article entitled "Best Practices in the Identification of Gifted Students with Learning Disabilities" although I can't say that we really know what's going on with our dd even after reading it and after a lot of testing!
http://www.gifted.uconn.edu/siegle/Publications/PsychInSchoolBestPractices.pdf
