GRAND MARSH, Wis. (Reuters) — Enbridge of Canada expects on Monday to begin replacing part of a pipeline that leaked more than 1,000 barrels of oil in a Wisconsin field, shutting down a crucial conduit from Canada.

The spill on Friday was the latest in a series of episodes that threaten to damage the reputation of Enbridge, a company that began its most ambitious expansion program ever just two months ago. It came almost two years to the day after a ruptured Enbridge line fouled part of the Kalamazoo River in Michigan.

Enbridge said on Sunday that it tentatively planned to install a new section of pipe on Monday, although it was still unable to say when its Line 14, which moves 318,000 barrels a day, would resume service or what had caused the spill, which blackened a small field but did not appear to cause major damage.

“The line has been uncovered to begin removing the failed section and send it to a metallurgical lab for examination,” said Damon Hill, a spokesman for the federal Pipeline and Hazardous Materials Safety Administration. An agency official said that all of the pooled oil had been cleaned up.