A Malaysia Airlines Boeing 737-800, registration 9M-MXD performing flight MH-180 from Kuala Lumpur (Malaysia) to Chennai (India) with 141 people and 7 crew, was enroute at FL360 about 140nm eastsoutheast of Chennai when the crew initiated an emergency descent to FL100 due to the loss of cabin pressure. The aircraft continued to Chennai for a safe landing about 35 minutes after leaving FL360. The aircraft remained on the ground for about 17 hours, then departed for the return flight as flight MH-181D and reached Kuala Lumpur with a delay of about 14 hours.