Looking for a service manual for GN payphone

[TeleDK]

Is someone able to send me a service manual for the danish costumer owned payphone GNT 502 for danish Korner.

Thank you,

TeleDK

[TeleDK]

This is a very difficulty projekt, to find the service or costumer manual.

I have no idea, why nobody has this manaual stored or copied??

Many of this phones are installed in restaurantes or cafes.

Greetings,
TeleDK