Any installation or repair should not impact the eligibility for PPDR, provided the repair work does not impact the ash footprint (spread it around, expand it, or otherwise complicate cleanup).
However, please remember that any impacted area of your property that was burned by the wildfire with residual ash and debris, will be considered hazardous. Per the County Public Health officer declared public health emergency and Order, deems all wildfire properties a hazard to human health and welfare. If the repair activities do not disrupt the footprint of the wildfire damage – meaning the activity further pushes, spreads, expands, or otherwise complicates the clean-up for the remaining part of your property, this may make your property ineligible for the PPDR.