I just got off the phone with Mountain West Insurance. The HOA does have coverage from CAU Insurance to reimburse for some proportion of the mitigation. I have not seen an invoice from Gerbaz but we did pay All Valley Resource Plumbing and Colorado Site Services (porta-potty) for their portion of the work.
If you have questions, Mark was the primary HOA point-man on the work done. Also be aware that Scotty submitted a claim to CAU for damage caused by the sewer backup.