RONALD S. ABRIGO, ANABELLA S. ALTUNA, RYAN JAMES V. AYSON, FLORENDO B. BATASIN, JR., LEONOR C. CLEOFAS, ALL OF WHOM WERE OFFICERS AND EMPLOYEES OF METROPOLITAN WATERWORKS AND SEWERAGE SYSTEM CORPORATE OFFICE [MWSS-CO], PETITIONERS, VS. COMMISSION ON AUDIT (COA)COMMISSION PROPER; RUFINA S. LAQUINDANUM, DIRECTOR IV, CORPORATE GOVERNMENT SECTOR CLUSTER 3-PUBLIC UTILITIES; EYREN MARANAN-YULDE, IN HER CAPACITY AS MWSS-CO RESIDENT COA AUDITOR; AND ANGELA B. BULOS, AUDIT TEAM LEADER, RESPONDENTS