Briefly explain the difference between maintenance and maintenance concept. Describe in details a system approach in maintenance engineering. Trip is a welding company situated in Limpopo. The company operate 24 hours a day for five days in a week. The company is not operating on weekends. In one week of February 2023, the welding machine failed and was fixed after two days. The machine start to function again. Use this one week machine history to calculate the availability of this equipment in that one week. Define the most important objective of the maintenance function. Briefly explain Field level in maintenance engineering.