Not able to unlatch tilting cab on 1989 Mack Midliner

I have a 1989 Mack Midliner MS200 and I am having a problem getting the cab tilting latch to release.

The directions say to push the latch handle up to release the main latch and then pull down to release the safety catch.

When I push up, nothing happens. When I bought the truck a few years ago the seller was able to unlatch the cab to show me the engine but since then I have been unable to get the latch to release the cab.

Is anyone here familiar with this model of Mack...

Not able to unlatch tilting cab on 1989 Mack Midliner

Not able to unlatch tilting cab on 1989 Mack Midliner