Just for the record and not specifically apertaining to this incident:
1) All aircraft fuel/oil/hydraulic flexible hoses have pressure test intervals and/or ultimate lives. Engine hoses are usually replaced as a matter of course at scheduled engine change.
2) Overtightening hose or rigid pipe couplings can sometimes be as bad as undertightening, especially on aluminium alloy fittings.
3) Fuel filter bowls can leak if not tightened or locked correctly. The exhaust tail pipe can be in the vicinity on some aircraft.