Train encountered power fault at rear M2car departing station. Unable to reset.Fault persisted atBBT2, BGB2 and CCK2. Unable to reset. Train performance- ok. ~~~~~ #2670 Fault code 820/821/827. Check CCD fuse, INV1, INV2, BCH, RRE, L1, L2, K, all ok. Check CHRE-1 & 2 having burn mark. Replace CHRE 1 & 2. Conduct propulsion static test ok. Train line 1, 2, 3, 4, 5, 7 & 36 - ok. LB/HB operation ok. INV1 & 2 output current ok. Limited movement powering gate ok. Done by Zulq/Asruddin.  09/12/20.