A Sonair 76 C+ had a main gearbox malfunction last week offshore from Angola. Gos is an oil pump failure putting metal in the gearbox. They had the chip light, low pressure, high temperature. Fortunately they were only 5 nm or so from their departure vessel and managed to land back on. Heard that the oil company isn't happy they landed on the vessel and said they should have put it in the water. All hearsay.