Need someone that will repair my Phonic PAA3 sound analyzer

I cannot any decipherable information about getting my Phonic PAA3 repaired. Neither can I download the schematic diagram for it at this site.

I would be very grateful if someone could help me get this information. That unit is too valuable to not repair considering how expensive it would be to buy a PAA3X (?) for about $1.000.

Thank you,
Dan