Can a developer amend the CC&R'S after he no longer has declarant rights

The amendment is most likely invalid. Generally, CC&R amendments only become "binding" upon recording.

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Can the suppliers of a building material company take action against the homeowner i the contractors did not PAY their bill?

If the supplier gave timely notice to you as required by RCW 60.04.031, and they followed up with a timely lien filing, you can be required to again.