The San Diego County Water Authority announced Monday that it will begin precautionary repairs to a key pipeline in Bonsall.

The Water Authority said its staff detected potential weaknesses in a 48-foot section of Pipeline 4 just north of West Lilac Road in late January using acoustic fiber-optic monitoring.

Plans are to shut down and drain that stretch of 90-inch diameter pipe starting Tuesday. Work to replace the segment will continue until the line is back in service approximately 10 days later.