Doosan — Step 19 –

A Doosan service procedure — check it applies to your exact model before use.

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Procedure

1. Step 19 –
2. Visually inspect the catalyst
3. substrates for oil saturation. The
4. picture shown is a clean catalyst
5. for reference.

Source: manual:CCV Reroute Instructions.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.