According to ISRO's Mars Orbiter Mission (MOM):
Forward rotation of the spacecraft has been completed successfully.
What kind of maneuver is that and what is its purpose?
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According to a follow-up question in the comments to this ISRO's announcement on Facebook:
Rajesh B Nataraja: Basic question? The forward rotation is to alter the thrusters in the right direction for the sling shot?
ISRO's Mars Orbiter Mission: You are absolutely right!
So this maneuver was about positioning the spacecraft in the direction for the last Trans-Mars injection burn, which, according to ISRO on Facebook, has been completed successfully: