What was found
2 SECTIONS OF ORANGE DUCTING ON R/H SIDE OF FUSELAGE FROM FWD OF WING BOX NEEDS TO BE REPLACED. FS 527-629. (C-CHECK RO 11/28/2021) REPLACED UNDERFLOOR EXHAUST DUCT FROM F.S. 609.00 - F.S. 667.00 IAW CRJ-700 AMM 21-23-53-000/400-803-A01. REMOVED DUCT FROM F.S. 536.00 - 609.00 IAW CRJ-700 AMM 21-23-53-000-802-A03 AND REPAIRED IAW MHI RJ REO 670-21-23-031 REV - - DATED 2021-11-18. REINSTALLED DUCT IAW CRJ-700 AMM 21-23-53-400-802-A03. COMPLETED TASK CARD 51-900-1002-SKY AND FORM M-337. NO CHANGE TO WEIGHT AND BALANCE. REF ATTACHED CONTINUATION FOR WORK PERFORMED.