By Marc Jones and Rodrigo Campos

LONDON/NEW YORK (Reuters) -The former head of emerging-market debt at asset manager BlackRock and grandson of one of Bolivia's most famous presidents is offering to help the winner of next month's presidential election fix the country's debt problems.

The October 19 runoff is between centrist Rodrigo Paz and right-wing former President Jorge "Tuto" Quiroga who has said the country needs to renegotiate its $14 billion of external borrowings.

Sergio Trigo Paz, who at BlackRock was involved in some of the world's largest sovereign defaults from Argentina to Ukraine, told Reuters that Bolivia's woes meant "the vultures" - distressed debt investors - were now circling.

With the economy in disarray and barely enough foreign exchange reserves to cover two mont

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