在保证期内更换的部件，自更换之日起再行保修12个月

问题描述：

如何译？
Within the warranty time, the spare parts to be replaced should be guaranteed for another 12 months counting from date of replacement.
Right?

问题解答：

The parts that are replaced during the previous warranty can be extended a new 12-month warranty

问题补充的句子没有大的问题．我的意思是把extend用上去．延伸（延长新的12个月），这样就不需要翻译”自维修之日起”了，使句子更紧凑

componets replaced within the guarantee period
are entitled to another 12-month length of warranty from the time of replacement.

The replaced parts under warranty can have another 12 months' maintenance from the day it got changed.