At 15E31 and 15E6B replace
15E31  A2 34          MOV     C, RAM_26.4
15E33  B3             CPL     C
 ... and ...
15E6B  A2 34          MOV     C, RAM_26.4
15E6D  B3             CPL     C

with call to 1E080
15E31 12 E0 80        LCALL   0xE080
15E6B 12 E0 80        LCALL   0xE080

To call 1E080...
; Get XFALMIT threshold to B from code byte 1E0F0
E4       CLR       A
90 E0 F0 MOV       DPTR,    #0xE0F0     ; XFALMIT threshold codebyte
93       MOVC      A, @A+DPTR           ; Get code byte
F5 F0    MOV       B, A                 ; Move to B
; Get XFALMIT current value to A, compare.  Set carry if XFALMIT < threshold
90 FA 84 MOV       DPTR,    #0xFA84     ; Set DPTR to value
E0       MOVX      A,       @DPTR       ; Get value to A
B5 F0 00 CJNE      A, B, NEXT           ; A = XFALMIT B = XFALMIT THRESHOLD, carry set if XFALMIT < theshold
40 03    JC        +03                  ; If XFALMIL < threshold, carry set, we're good, do normal routine instead, jump over inverse routine next 3 bytes
; Inverse of normal MIL setting
A2 34    MOV       C, RAM_26.4
22       RET
; Normal MIL setting
A2 34    MOV       C, RAM_26.4
B3       CPL       C
22       RET