Surely if they are saying there's a gas leak, you aren't responsible for it if another company is last one there? Even if you gave a 12 month workmanship warranty period, if it's something someone else has touched then it has got nothing to do with you?
Imagine it was a water leak - you install new cylinder, another plumber fits a shower pump 8 months later, and hot water draw off leaks, you aren't doing that for free are you?
Maybe as Ermi said, get in writing if defect isn't yours, chargeable works.
Imagine it was a water leak - you install new cylinder, another plumber fits a shower pump 8 months later, and hot water draw off leaks, you aren't doing that for free are you?
Maybe as Ermi said, get in writing if defect isn't yours, chargeable works.