Tabor 8553 Function Generator Manual

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Recently I bought a Tabor 8553 function generator "for parts only" from ebay.
It looks like it has been tossed into the dumpster, mainly mechanical damage on the housing.
Plastic screws have been used to mount transistors and regulators to heatsinks (wtf), two of them have broken off and two NiCads have leaked but fortunately not corroded the PCB.
Overall the device seems to work but has not been completed yet.
I am sure I will be able to figure out the standard functions, but it also has arbitrary capability which might be more challenging to use.
The device seems to be from around 2000 but had been on the market for some years before.
Unfortunately neither 'the internet' nor the manufacturer provide manuals, which surprises me as this had been manufactured well in the PDF era.
I will give it a try and contact Tabor Electronics in Israel directly, but possibly someone here might have a user manual, maybe?...