Bloomberg reported that Deloitte has been retained as an advisor by a group of Bartec GmbH lenders that control about $30% of the oil and gas equipment maker’s debt as they negotiate with private equity owner.

According to Bloomberg, the private equity group, Charterhouse Capital Partners, has been attempting to convince the lenders — Ares Management, Idinvest Partners and Partners Group Holding — to make amendments to Bartec’s loan rules.

Bloomberg reported that the lender group has not agreed to the private equity group’s proposal.