Per fare rules not all changes. only routing or the time of the first flight. Here is the extract from fare rules:
BEFORE DEPARTURE
CHARGE USD 125.00 FOR REISSUE.
WAIVED FOR ILLNESS OR DEATH OF PASSENGER OR
FAMILY MEMBER.
NOTE - TEXT BELOW NOT VALIDATED FOR AUTOPRICING.
LOCAL SERVICE FEES MAY APPLY ON REROUTING/REISSUE
-------------------------------------------------
REROUTING PRIOR TO DEPARTURE
CHANGES TO TICKETED POINTS ARE PERMITTED AT A
CHARGE OF USD 125.00 PER TRANSACTION.
IF THE FARE LEVEL HAS INCREASED SINCE TICKET
ISSUANCE THE DIFFERENCE BETWEEN THE OLD AND NEW
FARE WILL ALSO BE CHARGED. IF THE FARE LEVEL HAS
DECREASED SINCE TICKET ISSUANCE NO REFUND WILL
APPLY.

BEFORE DEPARTURE
CHANGES PERMITTED FOR REVALIDATION.
NOTE - TEXT BELOW NOT VALIDATED FOR AUTOPRICING.
LOCAL SERVICE FEES MAY APPLY ON REBOOKING
-------------------------------------------------
REBOOKING PRIOR TO DEPARTURE
CHANGES ARE PERMITTED PROVIDED TICKETED POINTS
REMAIN THE SAME. IF THE DATE IF THE FIRST FLIGHT
COUPON IS BEING CHANGED AND THE FARE HAS
INCREASED SINCE TICKET ISSUANCE THE DIFFERENCE
BETWEEN THE OLD AND NEW FARE BE CHARGED.
IF THE FARE LEVEL HAS DECREASED SINCE TICKET
ISSUANCE NO REFUND WILL APPLY.