By the manual it's at 40000 km mark. If my odometer is to believe mine is at 30000 km, so 10000 to go. If owner before me didn't tamper with odometer as it sometimes happens to be... But it should be fine as all the documentation and service inervals look okay.
Try working through this fault finding process
https://www.dropbox.com/s/b1x1ojthv4h7925/Troubleshooting 3P PMG %26 RR.pdf?dl=0
Or this one
https://cdn.shopify.com/s/files/1/1091/5694/files/fault-finding-diagram.pdf?235929069374954073