as levo said the 3tj forks aren't adjustable,
well not without taking em apart and changing the spacers to give you more/less preload tension on the springs,
or changing the springs as well as the spacers for some weight related springs with the correct spacers, ie the springs are generally much shorter and tighter wound, with longer spacers, imo i'd steer clear of generic progressive springs cos one size don't fit all
but before you decide to spend some dosh on it, make sure the garage did the job properly
did they use 10wt fork oil and did they put the correct amount in, too little oil would make it soft as, same for to light an oil
also the 3tj1 and 3en2 were made in the same year,
were they working from the right manual, the 3en2 had smaller diameter forks so less oil than the 3tj1
tbh unless they know their sh*t most garages could't tell the difference between a 1wg and a 3tj7
