Sorry for grave digging...
But this is maybe interesting:
"Advantest Measuring Instruments repair/calibration support have
transferred to third party company "Three-R Corporation (in Japan)"
since April-2017 so we will reply you on behalf of Advantest."
http://www.three-re.co.jp/english_top.htmlAnd of course:
"In any case, we do not provide maintenance manuals, circuit diagrams,
instruments internal technical information and any other sensitive
technical information to customers."
So they have the stuff we want.