Incorrect PAN on last year (2006-07) tax return/ Form16

Just week ago I observed that my this year (2007-2008) Form 16 was having wrong PAN (single character mispelled ‘P’ to ‘N’ ), however I got correct Form 16 from employer and filed tax return.

But on checking my previous year (2006-2007) tax return ack/ Form 16,  it was also having wrong PAN ). My employer has deducted all tax (TDS) against that wrong PAN.  Can TDS be revised against correct PAN ?

Can I file revised tax return for year 2006-2007 now. do i have to pay any penlity also?

Pls advise....

thanks in advance,