Do I need to drain the crankcase before removing the heating water return line that's obstructing the final bolt of the fan bearing bracket?

For the same water return line, the manual says to 'replace seal (27a)' - can I reuse the existing seal if I pull that water line out? If I need a new one, is it a generic one that can be purchased anywhere?

The manual also says for the 124 model that I should 'replace seal (97) in timing case cover' - I didn't see a seal where it's pointing to in the diagram, do I need to worry about anything?

When attaching the idler pulley to the fan bearing bracket, what torque should I have my wrench set to?