Pulling down of the trunk has always been closing assist!!
The trunk handle & back-up antenna's have always been central locking(PSE pump).
Check the original complaint, trunk handle & back-up antenna are the problems.
Only 1992 & early 1993 cars were modified as far as closing assist signal switch.
There is a vacuum element that is controlled by central locking pump operation that is on the trunk lock, look at the vacuum circuit & complaint!
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)