MC2200 Right Channel No Sound Sometimes; Cost to Fix

I have a MC2200. It was in good working condition. I recently hooked it up after moving my system to a different room. Recently I have noticed the right channel has no sound occasionally. If I lift the bottom right hand corner up and down, the sound will come back. Sometimes, after the sound has come back, it would loose sound again after a playing a few tracks of songs. Other times, I have to pull on the top right hand corner of the face plate and the sound would come back. I started leaving the power on button in the "ON" position and turn off the power strip. Sometimes it would have sound from the right channel and other times there is no sound from the right channel. There is a loose connection somewhere I thought. I know there is a common issue with this model especially on the right channel. I have read some other posts and did not find a common quick fix to this issue. What is causing this to happen? I paid under a $1000 for this amplifier and is willing to pay some money to get this issue fixed. What is the ball park estimate to get this issue resolved? Will $300 be enough to get the unit serviced and get it back to working condition? Also, if it does need to replace the capacitors which I don't think is the case. How many capacitors to replace and how much. I would like to know this before I take it to one of the two shops in town here. One is an official service center listed on McintoshLabs.com and the other I see another Mcintosh owner listed his power amp and he has taken it into the small owner operated stereo service center. Thank you in advance for your post and any advice you may have. I am planning to have it worked on in 2 weeks. More research is required. Cheers!