Subsequent 37 Headphone output faulty

Hi, on my Sobsequent 37 the headphone output is not working.
I tried different headphones (Beyerdynamics DT 770 Pro 250 Ohms, DT 880 and Soul Byrd), but no sound at all. Any suggestions about that?
Unfortunately my guarantee has expired in november (11/05/2019). I have heard MOOG is shipping repair kits for customers, or should I visit a local repair center (Germany / Munich)? I would be very grateful for a few suggestions.
Thank you very much.

Guten Morgen!

ask the german importer for Moog:

EMC Electronic Music Components
Stefan Hund
Tuchmacherstr. 7
89129 Langenau
Telefon: 0049(0)7345/80098-00
Telefax: 0049(0)7345/80098-11
E-Mail: info(at)emc-de.com
Internet: www.emc-de.com