To illustrate Hossers comments I offer the following on statistics.
I contacted a major UK airlines technical department to point out that nowhere in their maintenance schedule did it call for any lighting to be checked other than emergency lights.
This is from Preflight to C check.
I had just received an aircraft off C check with over 40 cabin filaments out.
The response was
"" If you can statistically proove that this would lead to an aircraft delay we will do something about it""
Well it is'nt my job to statistically proove f**ck all, so nothing was done.
This gives a small insight into the mentality that engineers now have to deal with.