Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

That is totally unacceptable.
Who the hell makes boilers with out testing them .
The cross tubes are inside the  flue which is inside the boiler .
There is no easy fix for that
 The central flue and cross tubes should be hydraulic tested before inserting in the boiler shell
They should be sending another one promptly and paying you to send the dud back

Cheers
Dennis