BRIEF-Enbridge says can replace light barrels with heavy on Mainline system
Feb 19 (Reuters) - Enbridge Inc
* Says if light oil volumes decline on Mainline system will be able to replace some of that with heavy barrels
* Says has been asking for and getting letters of credit from a few shippers whose credit rating has dropped below investment grade Source text for Eikon: Further company coverage: (Reporting By Nia Williams)
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