台达7KVA的UPS让蟑螂给炸掉了

前天接到一台台达7KVA的UPS,现场检测的情况:电池电压235V,市电输入开关跳闸,按开机键面板无任何显示,将机器打开检测,功率板严重损坏,在功率板损坏处下面有一只小强被炸掉了一半,整流器板损坏.现在将图片传上,让大家帮忙分析一下,这只蟑螂是怎么能够进入UPS内部的??
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