Sleep Indicator Light (SIL) not functioning

Hello,
I own a Macbook Pro 13" (Mid 2012 model).
The unit was purchased in March 2013.
However, I notice that the indicator of sleep (SIL) no longer works, and that already a long time.
Not when starting up the macbook, not when the macbook is brought into sleep mode.
This is the case both with OS X 10.8 (Mountain Lion), 10.9 (Mavericks) and 10.10 (Yosemite).
For problems with SIL Apple recommends to do an SMC reset.
I've done this, without success.
Other suggestions / tests that can help me to solve the problem?
Kind regards.

Have you tried to reset the Power Management Unit (PMU)?
http://support.apple.com/kb/HT1431?viewlocale=en_US

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