Found my lense is moist on the inside which is a WOF (MOT) issue,it has some minor cracks so thought I would remove it and repair ,when removing I found when taking off the rear plug the wiring just fell off...another issue bugger it. Inspected the housing and found the lense just popped off with little effort and was obviously the cause of the moisture inside ,it was superglued on and rather poorly at that. Found the plug wiring had poor contact on to the metal strips that contact to the lamp,luckily this section clips inside the lamp holder and is removable so cut back the melted plastic and soldered new wires on (rather tricky) and refitted to test and good result and my indicator switch is fine now as I thought it was shit on my last test drive and needed replacement/repair. Point is unlike previous work on my car which has been a constant discovery of more jobs to do and finally I can move on with 2 jobs out of the way .
Not often a corrado has an easy fix but damn they are a good looking car. Is it an early or late model lense that you have?