MUMBAI, March 29 (Reuters) - Lupin Ltd, India's third-largest drugmaker, said on Tuesday it did not expect any disruption to supply from its main manufacturing plant despite what it called minor observations made by the U.S. Food and Drug Administration after an audit. Shares of the company fell as much as 14 percent to their lowest in about one-and-a-half years after CNBC TV18 reported about the observations at two units of the Mandideep facility in the central Indian state of Madhya Pradesh. The company did not clarify what the observations were but said in a statement they have already been addressed. The U.S. FDA conducted the audit last month. (bit.ly/1RwOBQA)