Ticket upgrade question

[minmate]

I have some old non-expiry tickets from 2004/2005 that have 4 days left on them. Can I upgrade them to say, a 5-day non-exp tix? How do I know how much they "should" cost me. Is it the difference of a current 4-day ticket and current 5-day ticket or is it the difference of what was originally paid for the tickets? They were 7 or 9-day tickets to begin with I think.

 

[erionm]

All upgrades must be done within 14 day of first use. This applies even if the tickets have the no expire option.