Rear Latch Issue

Do you mean physically cannot latch or it does latch but the dash shows the latch is open and therefore can't engage the gear?

 

If you can't physically latch it shut, open up the latch box cover (there's like 4 small screws) then adjust the cylindrical cable pull lock to give it a bit more slack and it should work.

If you can latch it but the light on the dash shows it's still open then you need to bend the metal flap on the microswitch a bit so that it engages the switch better. This microswitch is also under the latch box cover.

 

How tight are the nuts on the striker plate on the engine lid? Sometimes the adjustment nuts work loose and the lid doesn't sit properly. On this type of mechanism, there may be nuts on both sides of the striker plate.