What was found
EXTERNAL A/C POWER RECEPTICAL MOUNTING CHANNEL IS CRACKED. DISCONNECTED THE MAIN BATTERY IAW CRJ900 AMM 24-32-00-040-801-A01, CONNECTED MAIN BATTERY IAW CRJ 900 AMM 24-32-00-440-801-A01. REMOVED AND REINSTALLED EXTERNAL AC POWER RECEPTACLE USING PN NAS1149DD332K NUTS PO 5-8434 AND MS21042L3 WASHERS PO 5-10302 IAW CRJ900 AMM 24-41-03-400-801-A01. CONNECTING MAIN BATTERY, ENERGIZING GROUND SERVICE BUS FROM EXTERNAL AC AND RETRACTION OF THE ADG REQUIRED. REFER TO JOB HR00381925 FOR RETRACTION OF ADG. REMOVED AND REPLACED EXTERNAL A/C POWER RECEPTACLE MOUNTING CHANNEL PN CC670-33401-3 IAW CRJ900 SRM 51-40-11-001-001-A01, 51-42-06-001-001-A01, 51-42-13-001-001-A01. APPLIED PROTECTIVE SURFACE COATING IAW SRM 51-21-16-001-001-A01.