What was found
CB PANEL 1: E3 AND M10 POPPING; CB PANEL 2: U3 POPPING. LOST CABIN READING LTS AND PASS SIGNS, EMERGENCY LIGHTS ON AND OFF UNCOMMANDED THROUGHOUT FLIGHT. T/S & FOUND WIRING HARNESS P5402/P340 DAMAGED. REMOVED L FWD WARDROBE UNIT IAW 25-24-01. R&R P5402/P340 WIRING HARNESS. REINSTALLED L FWD WARDROBE & FOLLOWED TS #:009471B. PERFORMED OPS CHECK OF PAX SIGNS/EMER. LTS IAW CRJ 900 AMM 33-47. OPS CHECK GOOD.