My ds was:
Verbal comprehension - 95th percentile - superior
Perceptual reasoning - average
Working memory - high average
Processing speed - low average
He scored highly on two out of the three Perceptual reasoning subtests, but much lower on the third, which brought his score down. We have since discovered he has a visual control problem which would explain this discrepancy. With the visual issue corrected/removed the EP expects he would be high average or superior for PRI.
With working memory, his digital span was apparently particularly high. This is what the EP said about the working memory section of the WISC:
The two subtests administered are a measure of working memory abilities. Tasks that require working memory require the ability to temporarily retain information in memory, perform some operation or manipulation with it and produce a result. Working memory involves attention, concentration, mental control and reasoning. Research suggests that working memory is an essential component of other higher order cognitive processes, as well as being closely related to achievement and learning. X's scores indicate that he performed in the high average range.
If you take into account my ds's undiagnosed visual problem, their profiles are quite similar, although my ds has a slower processing speed than yours.
My ds was dx with Aspergers, a month after he did the WISC, at a mutli-disciplinary assessment that included consideration of his WISC results a as part of the process. The EP responsible for ds's WISC was present and involved with the dx.
I'm not sure if I'm exactly right on this, but a WISC test cannot test for non-verbal communication skills, which is essential in dx AS. As far as I am aware, AS should not be discounted based purely on WISC results.
A dx of AS requires evidence of traits from all three areas of the triad of impairments. I was going to link you to the NAS information about the triad of impairments and how it relates to AS, but it seems to be down at the moment.
Who carried out the test for your ds?