V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

PTF
       Program Temporary Fix (IBM)


The Free On-line Dictionary of Computing (30 December 2018):

Program Temporary Fix
PTF

    (PTF) (Colloquially: Probably This Fixes) An
   IBM sanctioned patch, often implemented using ZAP or
   SUPERZAP.

   (1998-07-08)