Malfunction 3 : Medicine. Any condition of a device or an equipment item that causes it to operate improperly, but does not prevent the performance of its design function. (RP 14C)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}