Kawasaki KZ 750 E – turn signal no longer, newcomer

Hello, I got the old “girl” bequeathed by my brother. So far so good. However, the turn signals no longer go for 2 weeks. Since I am not yet knowledgeable I ask quite bluntly for help. Where do I start looking best? Light bulbs are usually, fuses under the left side covers were also quite. I have no idea where the relay is sitting etc. Thank you in advance