If I'm not mistaken here, you are always saving d'008' to
W_TEMP, not ? Should not "MOVWF      W_TEMP" come
*before*  "MOVLW     d'008'" ? Something like this :

 MOVWF      W_TEMP                ; save W contents during ISR
 SWAPF        STATUS,W             ;
 MOVWF       STATUS_TEMP     ; save status to Bank 0 temp reg
 MOVF         PCLATH,W                     ;
 MOVWF     PCLATH_TEMP        ; save PCLATH in temp reg
;
 CLRF            STATUS                 ; select Bank 0 and clear IRP
 MOVLW     d'008'                      ; reset Timer 0 by reloading TMR0 reg
 MOVWF      TMR0                      ; FFh-248d=8d (req'd for 1.00ms overall Timer 0 rate)


Jan-Erik Svderholm
S:t Anna Data
Sweden


> MOVLW     d'008'                      ; reset Timer 0 by reloading TMR0 reg
> MOVWF      TMR0                      ; FFh-248d=8d (req'd for 1.00ms overall Timer 0 rate)
> MOVWF      W_TEMP                ; save W contents during ISR
> SWAPF        STATUS,W             ;
> CLRF            STATUS                 ; select Bank 0 and clear IRP
> MOVWF       STATUS_TEMP     ; save status to Bank 0 temp reg
> MOVF         PCLATH,W                     ;
> MOVWF     PCLATH_TEMP        ; save PCLATH in temp reg

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