My trunk light works intermittently. I pop the unit out at the driver side wheel well area, and give the bulb a spin. Works for me every time. It could be the bulb or a loose connection. I have three vehicles to maintain. And, this issue is last on my DIY list. Good luck.
Caution: The proverbial light at the end of the tunnel may be an oncoming train.
*1999 CARRERA C2; BLK/BLK; 6-SPD, ROW M030 SUSPENSION; AERO KIT: GT3-MK1; SPORT SEATS.
*2000 MERCEDES BENZ E55 AMG; BRILLIANT SILVER; STOCK; ONE OF THE LAST GERMAN HAND BUILT BY AMG; DAILY DRIVER.