There are oil drops on the floor / frame or onto the gearbox:
Check oil level from gauge: overfilling can be the cause of leakage during gearbox functioning.
Sometimes the oil can come out during transport and/or installation phases, in case gearbox is tilted by more than 25°: carefully clean the surface removing oil drops to monitor afterwards no more oil drops are noted.
Identify exactly the origin of the leakage (“leakage area”) and contact our after-sales service, describing the problem with gearbox serial number.