How can you repair a daewoo matiz gearbox oil leak?

To repair a Daewoo Matiz gearbox oil leak, start by identifying the source of the leak, which may be from seals, gaskets, or the gearbox casing. Clean the area around the leak to remove any dirt and old oil. If the leak is from a seal or gasket, replace it with a new one, ensuring proper sealing. For small cracks in the casing, you can use a suitable epoxy or sealant, but if the damage is extensive, consider consulting a professional for a more comprehensive repair.