Cat urine = instant death. I guess the acid content is so high is looked like the PCB had been exposed to fire.

As a technician at a rival company to ATT in the US, I can tell you that the LDI or LCI is usually just that, an indicator. We see one of those tripped and then dig deeper into the device to see if there is further evidence that the device has been exposed to abnormal conditions, like a toilet. Some of the non-full service stores may not look so deep, but all of ours will take a device completely out of it's housing before making the determination. We're really not out to screw the customer, unless he's a douche.