Sound on Macbook Pro Retina is faulty, plays at lower pitch than it should

Retina, 13-inch, Late 2013
Memory  16 GB 1600 MHz DDR3
Graphics  Intel Iris
Software  OS X 10.9.4
I turned on my mac this morning and the mac logo chime was a lower pitch than usual. I thought it might have just been me then I played a track on itunes and figured that this was the same of everything. Every sound that comes out of the speakers is the same(an octave lower)
I have already reset the PRAM and the SMC
I have spoken to two Applecare instant chat staff and they are clueless.
I would really like to get this sorted without going to an Apple store because, as per usual, I cannot get a booking.
What now?? please help
MacBook Pro with Retina display, OS X Mavericks (10.9.2)

thanks for the reply. I ran the AHT by rebooting and holding D. While a ran the test there was no fan noise. The test found no probems. After restart the fans speed up again. Since my last post I've installed the iStat widget. My temperature (F) and fan speed readout is as follows:
HD: Macintosh... 112
CPU/ Heatsink     122
Airport Card          121
Enclosure Base     92
Enclosure Base 2     92
Enclosure Base 3     85
GPU                       140
GPU Diode               155
Right Fan          ~5500 RPM
Left Fan               ~5900 RPM

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