Originally posted by ivan_nz1
I would be very surprised if borer could be causing such serious damage without previous issues being evident and very obvious. If the borer has been adequately treated, then I would think that any damage to the stair could be successfully supported without the need to replace the entire staircase.
In consultation with your PM, arrange a builder that you trust to inspect and advise. Go into the house with your builder and ignore the tenant and PM. Communicate only with your builder.
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