the two I/O statements are (AUDIT.TRACE.RCINHST is SET to TRUE)
        GOSUB OUTPUT.RCINHST
.ifdef  AUDIT.TRACE.RCINHST
        WRITE (AUDIT.TRC,RCINHST.FMT)
.endif
the "OUTPUT.RCINHST" function ultimately invokes:
!================
WRITE.TO.RCINHST:
!================
        RC.GOOD.WRITE$ = Y.ANS$
        WRITE (RCINHST.LUN,RCINHST.FMT) KEY=RCINHST.KEY$, _
                                        EXCPSUB=EXCPSUB.WRITE
        RCINHST.GOOD.WRITE$ = RC.GOOD.WRITE$

        RETURN




What Appears in the Keyed File: (~~ indicates a break in the file of about 800 bytes :)
   Key: VULC722013-06-12@11:02000013    
        55443333332332334333333333332222
        65C3722013D06D12011A020000130000
Record: VULC722013-06-12@11:02000013DETAIL~~VULC72                                                                                          .00                                                                                                                        
        5544333333233233433333333333445444~~554433222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222233222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222
        65C3722013D06D12011A0200001345419C~~65C372000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000E00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

                             
What Appears in the Flat Text File: (~~ indicates a break in the file of about 800 bytes :)
        VULC722013-06-12@11:02000013DETAIL~~VULC72                        Monthly-###.##-Office 20 Line                                   20.00
              data names in ^RCINHST.INC:   RCINHST.SID$..................RCINHST.PLAN.AFTER$..........RCINHST.PLAN.BEFORE$..........RCINHST.ANNUAL.PLAN.UPLIFT
              
              
In a nutshell:  The file used to "end" at RCINHST.SID$
then, 3 new elements were added:
RCINHST.SID$;_                  !    30    30   781!<<AB>>
RCINHST.PLAN.AFTER$;_           !    30    30   811!<<AD>>
RCINHST.PLAN.BEFORE$;_          !    30    30   841!<<AD>>
RCINHST.ANNUAL.PLAN.UPLIFT      !     8.2  10   871!<<AD>>

I will mention that RCINHST.SID$ typically only had about 6 characters in it, 
so... if 800 is some kind of buffer size, I never would have known this since
every record would end before the 800 figure.