It sounds to me as if he didn't use transformers at all. Transformers don't often fail. He has used switch mode power supplies, sometimes wrongly called electronic transformers (there is no such thing).
Get real transformers, or better still go for 240 volt LEDs.
Even better go for a wound transformer to supply around 9 volts AC, rectify and smooth to 12 volts DC and use this to feed 12 volt lamps with LED elements and constant current drivers..
It much easier to produce the controlled current that a LED element requires from a DC voltage of 12 volts than from an AC voltage of 230 volts.
Some 230 volt AC LED drivers do not provide constant current but instead provide pules of current that average out to the be the nominal constant current for the element. The pulses can be as high as ten times the nominal current. ( some very cheap one have even higher current pulses ).
This makes the LED appear much brighter but at the cost of shortening the life of the element. These lamps also produce light pulsing 100 times a second which can have serious stroboscopic effects when rotating machinery is being illuminated.