找出以下句子中的错误 On going through the L/C, however, we found the product be specified in it is Model UX166 instead of Model UX106 as contracted.

这个句子的主要错误在于语法和词汇的使用不当。首先，“On going through”应该改为“Upon going through”，因为“Upon”在表达“在......之后”或“当......时”的概念时，更加正式和恰当。其次，“we found the product be specified in it is Model UX166”这部分的语法有误。正确的表达应该是“we found that the product specified in it is Model UX166”。 因此，修改后的句子应该是： “Upon going through the L/C, however, we found that the product specified in it is Model UX166 instead of Model UX106 as contracted.” 这个句子表达的意思是：“然而，在审阅信用证时，我们发现其中规定的产品型号是UX166，而不是合同中约定的UX106。”