Errors in filesystem

[kondra007]

Sorry for my bad English.
Recently, I've deciced to find out level of fragmentation on my TS-220 with WD disks made for NAS.
I started checking with command:

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fsck -n /dev/md0

However, while checking I got lots of errors, that can be divided into 3 groups:

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1. Inode 58720651 has INDEX_FL flag set on filesystem without htree support. Clear HTree index? no [i](note: I didn't write "no" it was places automatically)[/i]
2. Problem in HTREE directory inode 242221074: block #10 has bad max hash
3. Problem in HTREE directory inode 242221074: block #11 has bad min hash

As a result, I got 1,1% of fragmentation (yay!) and warning: /dev/md0: ********** WARNING: Filesystem still has errors **********

How can I fix these errors without wiping all data? Maybe there're any ways to load LiveUSB to NAS?