What was found
NR 1 NACELLE FIREWALL SEAL TO FWD EXHAUST NOZZLE SHROUD IS DAMAGED. REMOVED EXHAUST FIREWALL SEAL RING IAW SRM 54-20-05. INSTALLED REPAIRED EXHAUST FIREWALL SEAL RING REF EO NR: DHC-8-400-78-L02276. REMOVED SEAL FROM EXHAUST FIREWALL RING IAW SRM 54-20-05. INSTALLED NEW SEAL ON THE EXHAUST FIREWALL RING IAW SRM 54-20-05 IAW EO DHC-8-400-78-L02276. BONDED SEAL ENDS TOGETHER IAW SRM 54-20-05 P.202 STEP 6.B.(5). DRILLED SHANK WITH DRILL NR 40 AND REMOVED SHANK WITH AN EASY OUT ON OTBD AFT LANDING STRIP ON LEFT NACELLE LOWER AFT SECTION.