T450 #2 Ram Slot Fault

[Four]

(BOOTS on 1st RAM Slot
Filling 2nd RAM Slot causes BLACKSCREEN
When 2nd RAM Slot is filled and pressed firmly, T450 BOOTS
Pressure released, screen fizzles out)

Tried
Contact Cleaner
Soldering a repair of Two of the #2 Ram Slot/MOBO connections STILL PROBLEM PERSISTS although there is continuity beetween the 2 joints and the board


Solder Repair of Ram Slot 2 Ineffective

Please advise