Metal_Geart: sorry, at the moment I can't elaborate more, because it's been five years at least since I last finished PA3. I could, however, look up the walkthrough I've got somewhere (iIrc it was Rikusu under the alias of 'Rieks', who submitted it to a certain XSW-magazine, halfways during the nineties!). Rikusu, if you're reading this, please do respond. That would save me the effort of finding the XSW mags in the attic 
It is even better it is complete solution 'manual' -indeed by rikusu- .So you haver not to seek in xsw magazines d-tail(waist of time)
I remember that I asked Mari of XSW it a time ago since they published it. I asked to publish it again -he had no problem- but since its Rikusu's work , maybe he wants to coop.
Now come on Metal_Geart, show some perseverence and just speak several times to everyone and you'll definately have enough hints to go on.
Even I did it, more than 10 years ago 