HP 7155B strip chart recorder Manual upgrade

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I have got a 7155B with serial number 1925A018XX with options 05 event marker and 135 (?). I have bought the manual by Artekmedia but it covers only SN 1550 and under. My recorder is not the same (3s/cm first span instead of 10s/cm) and the chart drive boards are deeply different : A4 oscillator is running at  about 1KHZ instead of 352,2 HZ and the A5 board has nothing to do with the A5 in the manual (parts location and divided frequencies to drive the motor ). Does anybody get the op and svce manual for this SN or the yellow sheets upgrading the sn 1550 manual to the latest SN ? Thanks