MOLEX connectors in general (used on many amps) and multitude of other applications.
The connector "pins" are held into the molded fitting by small "ears" that lock the pins in place. These can release and the pins push out or back in the molded fitting, causing the connection to not seat properly.
Yes as stated inspect the pins for damage and push them forward in the housing, then pull back slightly to make sure they are locked in position. If one or more pulls out, then inspect the shaft of the pin and look for tiny "ears" that extend away from the main shaft. Then bend those out slightly and reinsert the pins in the correct location. You should then feel it "lock" back into position.
Simple continuity test on either side of the connector should show good. If you find an issue they are fairly easy to repair, with the correct size pins and a crimp tool.
I have also seen the molded housing expand or warp from heat causing the pins to push out or wobble causing poor or no connection.
NEWARK (Chicago office) has MOLEX products, as well as many other vendors.
GL
All the Best
Gary