Pot:
Are you saying that you have devices wired with Al conductors, or are the repairs in the feeders???
Over the years with tools, I had a few issues with Al conductors (#4 & #6) that were installed for parking lot lighting circuits. Deterioration from the water (UG) over time caused burnouts, and it was a PITA to make repairs.
Cracks or scratches in the insulation allowed corrosion, and over time...burnout and fry the PVC conduit.
Budget saver when installed originally, but a budget buster on repairs.
The repair was all over. The Al neutral feeder had come loose at the first pedestal, closest to the panel, and as a result it was creating the inevitable whacky voltages further down the line. Even the receptacles themselves were connected with Al and they weren't Al rated devices. Some of those connections were broken but not obvious. Overall a real messy install that I thought was done to save money.
